Girlfriend and I broke up but I suggested getting back together, now I regret it?

My girlfriend and I of a year recently broke up due to us constantly arguing about things within our relationship. Like her having a lot of guy friends and her spending a lot of time online hanging out with guys on streaming platforms. This was my first relationship and I am a very very jealous person and would ask her not to talk to other guys but she could never do it. So we ended up splitting up. I treated her amazing and was always there for her but I did overthink things a lot. The main reason we ended things was because she admitted to hiding a guy on her phone after I found out, she would also not tell me other things because she feared id get upset because of my jealousy, like guys hitting on her and things of that nature. So my trust was shattered. Its been a couple weeks and we've had some contact and I suggested that we try to have a super casual and exclusive thing for the summer. She said shed think about it and called me to talk. I later that night found out that when she called me she was on her way to smoke and hang out with a guy she told me she found "attractive, but she wouldn't ever do anything with". They stream together and know each other from the streaming platform she uses. I feel really disrespected because she spent the night and smoked weed at this guys place. Everything in my mind point to her hooking up but she maintains that she isn't sleeping around with other guys. what should I even do? because I love the girl but at every turn I just get stuff thrown back in my face. Id say jealousy is my main downside too, I like to think I'm and attractive guy but right now I'm not even sure. Do I just use this as fuel in the gym and move on? Or do I trust her enough to possibly try things at a very casual level?
Girlfriend and I broke up but I suggested getting back together, now I regret it?
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