Friends with an ex?

Long strong short I dated my ex for 1.5 years broke up 9 months ago, stayed friends because of mutual friends because we were getting along so well our feelings got confused and ended up having a week where we tried "dating" after we slept together after a drunk night out about 3 weeks ago. We decided not enough had changed for us to get back together but we do have feelings for one another however we have gone back to being friends. I'm going to try and avoid being as "friendly" as I was previously to this week, he always brings up things about the relationship and I don't want to talk about it anymore I don't want any reminders of our relationship. I've given up on anything in regards to him, it's not worth caring about when he's not. I can't and don't want to completely cut him from my life but I don't know what I'm suppose to do... help please
Friends with an ex?
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