Guys, my boyfriend is manipulative, dishonest, doesn't take our relationship seriously, and has made me cry multiple times. Hugs/advice?

Hi everyone, So, my boyfriend of several months has been amazing. He loves COD, he's ridiculously sexy, he's close with his family, he's funny, and he cares about me (or so I thought).

A few weeks ago, he randomly dropped out of all contact. No explanation until he randomly surfaced a week later to say that he'd found out his mom has cancer and had dropped out from everything (work, family, me, etc). While still annoyed, I can sort of understand that. I was still hurt though.

I live in a place where there's not that many gay people at all (read: everyone knows everyone) and one of my friends found my bf on Grindr/Jack'd. I confronted my bf about this and explained why it was so hurtful that he'd do that, and that if he wanted out relationship to continue, he couldn't be on them anymore. That was a month ago.

Recently, he often takes hours to respond to anything, and he he'll often make plans and promise to see me (we live about an hour away from each other). I'm always disappointed and down whenever he ditches me like that, and I've told him. He, however, always manages to somehow make it seem like it's my fault (and not just with this; whenever there's something we need to work through, he always turns it against me)

Yesterday, I was hanging out with another friend of mine who had been in a city near him. My friend found my bf on Grindr and Jack'd. Again. I was (and still am) really pissed/sad. I tried to call my bf to talk about this, but he wouldn't answer, so we had part of a conversation through text. I gave him a chance to come clean, but he of course played innocent. I sent him a screenshot of his profile (where he was listed as single and looking for chats/dates/relationship, with a tagline of "Just searching around :)" ). He again isn't taking it seriously (responded with "And you know I was on there silly?"). That was the only thing he said though. No further word from him since 11:30PM yesterday.

tl;dr=My boyfriend has been on Grindr twice after I told him how much it bothers/hurts me; he often ditches me after promising to see me; he avoids rather than tries to solve problems; some other stuff

I guess I don't even know what I'm looking for, haha. Maybe just advice/affirmation that I'm not in the wrong and he's an ass?

Thanks. Y'all are awesome.

Edit: Fuck him. He's an ass who doesn't deserve my time, and I was being a wimp. Thanks for turning me around guys.