Broke up twice, still feel unsettled

So I ended up breaking up with my girlfriend for the second time, and I’m just trying to make sure it’s valid I guess, and venting a little. Two months in a found out she was installing and deleting the Snapchat app to talk to other guys behind my back, one of them apparently being one of her ex’s. She also went out and came back with pictures of other guys in her phone, their numbers, and texts between them. The messages were innocent but the whole thing seemed off.

So I decided to give it another chance, that lasted a couple miserable months of her just doing what she wanted and treating me badly before I had enough and left her. Then she tried 4 different ways to get in touch after I blocked her, apologized, said she wanted to get therapy and work things out. So I agreed to it. Silly me.

Fast forward two weeks to today, her profile showed “active 21 hours ago” on Messenger when I went on there to look at something else from marketplace. She told me she deactivated her profile and doesn’t have the messenger app on her phone but as soon as I called her out on it somehow she was magically active while at the golf course with nothing but her phone.

She has been doing things to get me to try to trust her after the first mess, but then other things keep happening that just ruin trust and I feel like I can’t take it anymore. Her and I got along and had a lot in common, but the repeated breaking of trust I can’t handle. For context, she’s 36, never been married, no kids, I’m 38, same situation.