I’m Having trouble with trusting my girlfriend of 3 years, am I overthinking it?

Anonymous
we’ve never talked about boundaries although I did try to bring it up. The trusting issue started about a year ago in March there was a new guy working with us and I didn’t like how flirty she was with him (always laughing, having conversations with him that didn’t happen with me etc) and It still happens even with my friends if they say something, she agrees with them but if i say anything remotely similar she acts completely different, i had talked to her about this but it seems it was for nothing, for the guy at work i talked to her and she said it won’t happen again, but it did a 2nd time and again i talked to her about it, happened a 3rd time and we had a big a fight over it as we were at a work party in the summer on a boat, she was next to me but constantly looking at this other guy and mentioning him every 5 minutes and i got pissed drunk because I was hurt as hell, and ignored it for the rest of trip, we came back to shore and he slapped her ass ‘jokingly’ as we got off the boat, and I just left, she came after me and I said ‘we were done’ I don’t care and she stormed off saying it’s not true, anyways we had a big fight and i said if she completely stopped the flirting in its tracks ie not entertain the flirting and make it clear that you’re not interested and she did, now we are different jobs and she’s talking about work parties happening every 4th night at an Igaming company and I don’t know how i feel about her going everytime, getting drunk, when in her team it’s 5 guys and her, and i honestly don’t know how to talk to her about it.
On top of it, she never calls me, i call her everyday, it feels as if i’m making all the effort but I get nothing back and to be honest were a year away from having our house built and it feels like it’s a huge mistake that i’m making.
I’m Having trouble with trusting my girlfriend of 3 years, am I overthinking it?
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