Before my current ltr became my ltr she was a fuck buddy. We weren't supposed to be seeing anyone else. She pulled some crap on me so i ignored her for a bit and then when we struck up contact again a week or so later and i tried to schedule a meet, she said she would be away for a week. Instead of asking where etc. Because she hadn't told me and was obviously trying to bait me into jealousy i just let it slide and saw her a week later.

Sturns out she went on a cruise with her girlfriends, two of which are comlete sluts. She told me she had been super drunk the entire time and said we needed to wear condoms now 'because i don't know what you've been dong'. Obviously i highly suspected she had done something even though she denied it so i made a mental note that she had voided the agreement and started fucking another girl without telling her.

Now a little while later she said some shit to make me doubt my assumption and emphasised us still being exclusive. So i got rid of the other girl, undermined my previous suspicions abour her cruise and eventually she became my ltr.

Recently we were talking about the cruise and she looked very uncomfortable so i baited the truth out of her. She admitted to as much as dancing with a guy all night, making out with him for a while, taking him back to her room and letting him finger her. She absolutely insisted she hadn't slept with him or done anything else and that when she asked him to leave he got really pissed.

I got this shit out of her under the premise that 'whatever happened, we weren't in a relationship then and it doesnt effect us now, i just want to know the truth. And if you dont tell me now and i find out later, we're done'. I also made out like one of her friends had already told me and that if she owned up to what i already knew i could look past it. So from that I'm inclined to believe they didn't have sex. But she kept this from me on multiple significanr occasions as we progressed into ab ltr and during the entire conversation of her admitting, i got trickle truth denial of anything more than kissing, then just a little touching, then only as far as some fingering. She became very emotional aggressive while telling me this and seemed more concerned with which of her friends had ratted on her than what she was admitting to me. She also started trying to justify things as 'i thought we were done' 'i didnt think we were going to see eachother again' 'you were talking to other girls so whats the difference!' 'I was upset!' 'You're interrogating me!' Blah blah blah

So my question is, what do i do about this? I slept with another girl too after i had suspected this was the case, but male hamstered my own way into unbelieving my suspicions and ltring a girl that cheated.

Does that count as cheating? Because i fucked a girl she doesn't know about after should i let it slide? And what does this say about her? That she's prone to jump into bed with the next guy who approaches her when she goes out drinking with the girls again? Im pretty cut up over this and considering plating a new girl and breaking it off with my ltr.