Sex with my Ex

So Sunday Me and my ex had sex, I felt a little weird about it at first but now I'm fine with it. We're not dating but we've decided to be friends but he says he still loves me and honestly I still love him too. I'm telling you guys all of this because I don't have anyone to talk about this with. We were talking about a friends with benefits relationship but I don't know those type of relationships never really work out. My question to you guys is have you or anyone you know been through something like this?