how do I get over what my ex put me through?

TLDR: my ex cheated on me and I just want to vent

Hello everyone,

I (F22) went through quite a rough time last year with my ex (M23). He was my first boyfriend. He also told me I was the first girl he had ever been with. I was absolutely smitten by him and I thought things were going really well between us. We had only been together for a couple of months before he went away for the entire summer on a working visa to a different country. This was hard on me mentally but he reassured me that nothing would change between us and that we would pick things back up when he came back in the fall. I know it’s very cheesy and clichè but I really did see a solid future with him and didn’t have eyes for anyone else at all.

Fast forward a few weeks of him being there, everything starts going downhill. I’m recovering from surgery which is already difficult enough and he’s making things worse by not being supportive and barely communicating with me. Eventually I reached my breaking point and sent him quite a lengthy text asking for some communication and clarification - I get no response and he goes on to completely ghost me and shut me out of his life. A few weeks go by and I still hear nothing from him. He keeps posting instagram stories of him and this girl together and that’s when it hit me - he was cheating on me and wasn’t even trying to hide it.

Fast forward a few weeks -he comes back home and I block him on everything and try to move on with my life. However, it affected me so badly that I had a breakdown and had to go on antidepressants for a few months.

One random day I am scrolling on tiktok and the girl he cheated on me with comes up on my fyp doing a livestream. Curiosity gets the better of me and click in to watch. She’s gushing about ”her man” (my ex) and talking about all the great things they did together last summer and how he came back to visit her for his birthday. She then goes on to say that she would like to get married and have kids with him and this is real deal love. She says that they have discussed these things and it probably will happen. He also bought her a promise ring and she was showing it off to everyone in the live. She also mentioned that she will move to the city where both my ex and I are from later this year, so i’m assuming they will probably be moving in together at least.

One of my friends went on a group holiday a few weeks ago and of course my ex was there because they used to go to high school together and they are both friends with the guy who organised this trip. My friend told me that my ex spent a while moping about the girl he cheated on me with talking about how “long distance is so difficult” and that it’s “hard to call her late every night“. Meanwhile, when we were doing long distance he didn’t call me once and didn’t even discuss it as an option. This is really making me overthink and question whether or not he ever liked me in the first place. How come he’s able to do this for her but didn’t even try when it came to me?

This incident has absolutely shattered my heart and I can’t get my head around it. I know it has nothing to do with my character because I did nothing wrong but my brain has quite literally been rewired to think that if I do or say the wrong things I will be abandoned by everyone important in my life. I don’t want to bring it up to my family or friends anymore because some of them get annoyed and tell me to just “get over it and move on“. I was treated quite poorly by a lot of people in my life who told me I was just being dramatic and sensitive. I just feel so extremely isolated and this has affected my confidence on every level.

The emotional pain from this is genuinely becoming unbearable to deal with and i’m not sure what else i’m supposed to do. I think this will haunt me for the rest of my life and affect any intimate / romantic relationship I ever have again going forward.I find myself in my head every single day comparing myself to her and asking what she had that I didn’t. I would love for someone to just say to me that i’m not crazy and this is actually a fucked up situation lol.