My OH and I have been together for 5 years and we have a newborn who is 6 months old. Our baby boy was planned as we had just moved in together a year previous to when he was conceived and up until a few weeks ago, I was completely content.
A fair few months ago, my OH went for a night out drinking and didn't come home until afternoon the next day. When I spoke to him, he insisted he was round a friends house and had fallen asleep. We have "Find my friend" installed so I had knowledge of where he was but didn't recognise the road (it's a town over from ours) so just believed him as I didn't imagine anything sinister had happened and I had full trust. Recently, he has a new phone so he asked me to help him delete and switch over everything. On his FB messenger call history (we were in the process of deleting apps as he was selling the phone, the call system which he never uses so very old logs showed up) were 3 calls he had made the night this had happened to his ex girlfriend. We had a massive argument and I told him I couldn't believe he hadn't told me, what on Earth did he do that for, etc etc and he received silent treatment for a few days. During that time I went full investigate mode, and noticed that his ex girlfriends best friend has posted saying that she loves living down OH ex road now she's moved into her new house. Another post from ex's friend says her road name and it is the exact same road OH was on the night he went AWOL.
I questioned OH on this and he got very upset and teary and insists he has no idea what went on as he was absolutely plastered and all he remembers is getting home the next morning and didn't know where he was the night before.
I'm not stupid. I know he went back there even though I don't have full solid proof that he did. I also don't have proof he's cheated on me but why else would you go back to an ex's house if it wasn't for that one thing? I am not going to contact her as I don't want to give her that pleasure so have no way of getting truthful answers as my OH "doesn't remember a thing".
I'm devastated. I have a baby and I just know I will struggle badly on my own. I have nowhere to go as my parents have now downsized and I no longer have a bedroom at home. I'm on maternity leave and receiving statutory pay and am in a tiny bit of debt (very manageable but just on a card from when I was a teen). I love him so very much but I have no idea if I should stay or go. WWYD? Could it be something I could potentially forget and move on from without fully knowing if he did?