Hi, I've been with my partner on and off for several months, and we have a serious relationship going everywhere together. After we split for the fist time he booked to go to Turkey with a mutual friend, and we later got back together and I joined them for the first week. Fast forward several weeks and we fell out and split. I know he's stressed because his mum is dying, but we've remained in contact almost every day. We opened up and told each other that we still love each other, that's when he said he wanted to talk to me about something. The following day he told me that after I went home from Turkey he got chatting with this woman and he ended up kissing her. He told me that he told her that he was in a relationship and trying our hardest to make it work. She then gave him her number and told him if it didn't work out between us, then he should get in touch with her, and he has since we split. She was friendly towards him at first, but later said she needed space, so he told her he was going to block her. My ex are trying to work through this as we've gone through a lot together and I don't believe he's cheated in the past. When he's on holiday he drinks a lot, and I'm wondering if this could well be a one off. He told me he felt terrible, but didn't want to tell me as soon as he got home for fear of us breaking up again. Any advice please?