I've been divorced from my ex-husband for 14 months. We were married for 15 years. Both in our mid-40s (45 and 46). We have one DC together who we have been co-parenting. There were a variety of reasons that led to the divorce. Some of it was him becoming increasingly grouchy and miserable towards the end, not taking care of himself and generally not making an effort with our marriage. Our sex life was also dwindling. He was always a great dad, but the marriage itself just wasn't working for a long time before we got divorced. I think to summarise, you could say we had irreconcilable differences.
Since the divorce, things have been amicable between us and we have been co-parenting our teenage DS. We occasionally meet up to discuss mundane things like who is paying for school trips or buying new trainers for our DS. Recently, the chats have been getting a little bit more cosy and intimate. I was at his house last week (he moved out after the divorce), and we ended up talking about our relationship situations. He said has had a couple of dates but doesn't feel ready for another relationship. I told him I am still single and haven't been dating anyone. We talked for about 2 hours. After we had been talking for a while, we started kissing, then it progressed from there and we ended up having sex. He initiated it, but I was a fully willing participant. It just felt right when it happened. I am now wondering if I should just leave it as a one-off and just continue as we were while co-parenting amicably, or if it would be a good idea to get into a friends-with-benefits situation with my ex-DH where we basically continue the amicable co-parenting, whilst also having sex occasionally to fulfil each other's needs in that regard. It seems clear to me that we still have residual feelings for each other. We haven't really discussed what happened in great detail, aside from me saying it was really nice, and him saying the same.
I've been looking at relationship posts on MN, Reddit and a few other places and apparently it's common for ex-partners to end up having sex, either as a one-time thing or an ongoing situation. Has anyone been in a situation like this with their ex, and what are your thoughts on my particular situation?