I've been crying all night reddit. I don't know what to do (need relationship advice)

Long story short. Me and my gf (ex?) are fighting. and before I continue on with this story I just wanna get some backstory. I'm gonna be completely and brutally honest so I can get the best advice possible.

Essentially my gf goes to work/school and her time is occupied what seems full time and we spend minimal time together. Her mom is sick (cancer) and she spends time with her too. I'm more then understanding of this and give her her space, but she has told me literally that she has no time for friends or barely time for me. I understand and am patient and will see her when I see her.

Now fast forward to last night. Last night it was her birthday and I recently found out she's been going out drinking with her friends. She says it was once, but I can't be too sure. I stormed out in a fit of rage on the dinner because my leg was shaking and I didn't want to make a fool of myself, cause a fight, or upset anyone.

I told her if she has no time for anything, why is she doing that? I don't care how much time you got, I'll savor every minute if it means being with you and I don't care what it is. She doesn't understand this and thinks I'm just being a jealous prick. I just wanna see her man, but whatever she doesn't get why I got upset.

So then I back to meet her at a club with her friends and the rest of the night goes smoothly. Then today hits. Boy was she pissed.

She got mad att me because my gift wasn't thoughtful and in the past I bought my ex a guitar and guitar lessons. (Long story short, I was a magician making decent money and I had no bills/rent/car insurnece etc etc to pay thusly I was able to afford these things). Mind you this was 2-3 years ago... anyway. I'm a home owner, pay taxes, every bill imaginable, gotta support my mom's tired horse shit and can only spend so much. I also drive an expensive luxury vehicle which costs a shit ton to maintain. So you're probably thinking "Oh well you got all this stuff, clearly you can afford to buy her nice things". I can and I will, but last year in October I went to jail for something I didn't do. I had to shell out 10 grand that pretty much got me out of jail (I was working for the senator in my state and couldn't afford to stay in jail, I was threatened to be left in jail for a month) and for my defense which got me off, but fuck was it shitty and heart breaking to go through. Also I grew up very poor and used to be one of those bad kids who roamed the streets. My dad was a dead beat and now that I've saved all this money and had/have good jobs i don't like to just blow it like its nothing, but my gf doesn't understand this at all.

I bought her a 120 dollar gift card, but it wasn't thoughtful to her. She doesn't really have hobbies, isn't into art or music, doesn't like science type shit or like techy/geek stuff so I had no idea what to get her. So I figured a gift card where she likes to shop would be ideal!

nope, not good enough, I'm a selfish cunt who only cares about myself. She also like weird Broadway shit.... but I ain't gonna buy her music. She likes glee shit, but I imagine she has most glee stuff so clothes it was!! it made sense!! but my gift wasn't thoughtful.

she also went on to say that all her girlfriends get gifts all the time from their boyfriends and I replied "well I'm sorry I'm not them! I don't live with mommy and daddy and I got my own shit to worry about/recover from".

It gets worse. I know a club promoter out here and he's been out of town taking care of his grandmother and spending the holidays with his loved ones. I asked him to help get my girlfriend a table at a club, but he couldn't do it. But this man has pulled through for me and my mates from europe all the fucking time and I did not hold it against him one bit that he couldn't do this one favor for me. My gf on the other hand went on to say "you go out all the time and get 1000 dollar tables, get bottles etc etc but you couldn't do this one thing for me". I went on to explain that my friend isn't around to pamper me like he always does I'm sorry I can't live up to your expectations also those "$1000 dollar tables" were provided by my friends from out of town, they paid fore everything out of pocket and we didn't bother dealing with the night life goons to do it..... I also didn't get her a birthday card. I think they're stupid and a waste. I end up throwing all mine away (is this wrong?) and I just didn't think she'd want one, my hand writing is shit anyway and it'd seem cheesy as fuck so I just did away with it, but once again she complained.

I feel super shitty and super hurt. She fucking crushed my heart man. Saying my gift wasn't thoughtful and shit, saying I'm not like her friend's boyfriends, calling me selfish, making me feel like scum!

what should I do reddit? I turn to your collective wisdom to cheer me up/make me feel better.

I think I'm a decent guy, I do good by my works, help others, work an honest job and pay taxes. I treat my gf very well and I always defend her/put her before others. Am I suppose to be showering her with gifts all the time? I always thought just being honest, caring, loyal, and just generally being supportive all the time is what it took to be in a functioning relationship, but I haven't been in a relationship in a long time.

I'm a slut man. I used to go out banging tons of girls, threesomes, orgies, crazy one night stands and then I settled down with this amazing cute girl who honestly gave me the impression she was super cool and down to earth until today.

She shattered that image and now all I see when I think of her are the little kids from My super sweet 16 or any of those MTV shows....