URGANT advice on boyfriend

Right so I’ve been with my boyf for a year and a half. Last year about 4-5 months in he went on a holiday with one of his friends i didn’t think anything of it as I thought I could trust him he didn’t tell me what they would be doing whilst they were out there so when i saw every night they were out partying getting so drunk and going out to shisha places with girls. I was going mad at home as I was hardly speaking to him whilst he was away my mind was going all over the place and I never got to tell him how I felt. Then like another few months past and a few rumours started to come up that he’d cheated and kissed another girl but he told me it was lies so I believed him then I go on his phone looking at his holiday photos and see a video of a girl that I recognised so I dmed her and she told me it was true that they’d kissed but she also had a boyfriend so she begged me not to tell her boyfriend. I didn’t tell him gut obviously went mad at my boyfriend who begged me to stay with him so I did. (Baring in mind we have been through a lot with other girls and rumours) now obviously I’m still hurt and upset but to him I’m over it. About last month his friend asked him to go on holiday again this year so he said yes just not to another party place whilst telling me that he wouldn’t go at all. As we speak he’s currently on the plane on holiday to the same place after lying to me saying he’s not going after watching me cry to him about it but him saying he has to go. What the fuck do I do