scandal overseas?

so this summer my bf of a year when on a school overseas trip to greece where 3 days of it were spent on a cruise. the whole trip was 2

weeks total and we actually couldn’t even be together on our 1 year. anyways. around early week 2 i had decided to go to the beach with some guys friends and my bf approved bc he knew the guys and said he didn’t mind. after the one guy came over to my house to play cards. (even though he told me he didn’t want them at the house) we just stayed outside and played cards. i ended up telling him he had came over and in result he broke up with me. he had sex with a random girl he met on the cruise. came back and asked for me back that day. and i accepted. bc i did not know the information. he has lied up until this day about what happen. until someone came into my work and told me what had happen, when finally confronted again he admitted to it. and to me it isn’t the fact that he did it, it’s the fact he lied when i asked him multiple times what happen. he leaves in less the a month for the navy and i am not going to even be able to trust him being deployed to other countries, bc if we got in one argument he’d go fuck someone else, and to me that isn’t love, so finally after a year and some change, things have ended and now i’m just upset that he would lie to me and hid these things from me and how and why would he fuck someone else and ask for me back a day later. i needed to rant and i always do that here, every so often. so please leave comment and opinions i need people to talk to during this time.