Does this count as cheating?

Alex

Me and my boyfriend broke up because a girl lied and said I was cheating on him when I wasn’t. Well me and him continued to talk and tel each other we loved each other because we did so we decided we were gonna a get back together but we wanted to work through out problems first. About 2 weeks after we decided that he went on a cruise with his family and we talked when he was on shore and once again he told me he loved me but when he got on the ship he tried to have sex with another girl (he wasn’t coordinated to do that job) and I found out after we made it official when he got home, but he says it’s not cheating because we weren’t official but I think it was because we were working towards getting back together. So is it? And how do I get over it?