When I was pregnant my boyfriend cheated on me with his friend. She told me that they kissed but he told her that we weren't together so she kissed him back but then she found out we were still together so she felt awful. I confronted him but he told me he was drunk but he doesn't drink so I knew he was lying. I broke up with him and we didn't message for a while until I was about 7 months pregnant (about 3 months later) he apologised and admitted he did kiss her but felt guilty and that he lied about us not being together as he thought I was going to break up with him (we had a small argument but I wasn't going to break up with him over it). We agreed to be friends and I allowed him to be at the birth. In March he asked if we could get back together, I said yes as he proved I could trust him and he was a good dad to our baby, he also told me he blocked his friend. Last night I went on his phones when he was asleep (not to snoop) and a message popped up from her and she said something like ‘i miss you, we should see each other soon ❤️’. I didn't click on the message and I haven't confronted him as I wanted to wait and see what he replied. I haven't looked yet as I haven't had a chance but would you find this suspicious?