Trust Issues in Relationships Due to Past Experiences

I need your honest opinions about this and i used gpt to summarize it if you want the full version lmk About five months ago I met this girl at a college party. Within 1–2 weeks we got really close and it honestly felt crazy how much we had in common, even though we’re from different countries and studying different majors abroad in same uni. After about two weeks of knowing eachother we slept together and she started staying over at my place for days sometimes. Everything felt good, but in the back of my mind I kept thinking: if she got that close to me so quickly, maybe she did the same with other guys. I started catching feelings and i could she feels it too but i wanted to confirm it, so I began asking more about her past. I found out she had been in a 3-year relationship and had broken up only about 2–3 months before meeting me. But when I first asked her, she said it had been 6 months since his breakup (which later on she said because i didnt know you much) but also lied about meeting a few guys after the breakup later on "2.5 months after knowing eachother" when i found out about it then she started talking about them too... Despite that, she treated me really well. We cooked together, spent a lot of time together, she tried learning about my culture and language, and she was very sweet. I started falling for her pretty fast. At one point she even asked if I wanted to be her boyfriend. I told her I don’t do casual relationships and that I need trust and reassurance first. She said she understood and was willing to wait. Then about 2.5 months after we met, I found the Bumble dating app on her phone. I was shocked. She said she had told me about it (which she hadn’t). She also said the account was deactivated and that the last time she used it was 3 months earlier. But when I checked, the last conversation on the app was only 3 weeks old. I felt really betrayed and told her to pack her things and I took her home. For about 6 days she kept calling and texting, but I needed space. Eventually I reached out again because I had gotten attached and wanted to understand the truth. When we talked, she explained that after her breakup she was emotionally lost and using dating and going out with guys as a distraction instead of properly dealing with the breakup. I asked if I was just another distraction. She said no, that meeting me was different and changed how she saw relationships. She also said she didn’t tell me everything before because she didn’t fully trust me yet either. Then she told me honestly about the guys she met after her breakup: • one guy she met in person and they only kissed • one guy from Bumble where they also only kissed and had drinks • another guy from New York who was about 15 years older than her, they went to his hotel and kissed but she swears nothing else happened, I didn’t like hearing that at all, but she begged me to give her a chance to prove she could be committed to me. I decided to try again. Now it’s been almost 2 months since that conversation and honestly things have been really good. We travel together, she supports me in my studies businesses and much more, she’s very caring, and she even unfollowed a lot of people so i dont over think because she knows i cared about her past and that bumble thingy and mostly just spends time with me and her two close girlfriends. She doesn’t party anymore either. The problem is that I still have trust issues. I hate thinking about the older guy she kissed, and once I accidentally saw private videos of her and her ex on her phone (I never told her) Sometimes when we’re intimate those thoughts come into my head that she did the same things with her ex or those other guys and it makes me uncomfortable. So now I feel stuck. We’re basically together but not officially because I’ve delayed it due to my trust issues. I don’t want to hurt her or hurt myself, but I’m already really attached and don’t know what to do.