Always one step forward to steps back?

I keep thinking and feeling as if I have moved on with my life and that I'm happy being friends with my ex and honestly I am but as soon as he says something that makes me over-think, question his motive or anything remotely like he is still interested in me its like I go two steps back again and I'm getting sick of it. It's not even that I want him back because if the opportunity arose I don't know if I would even take it, I think I just get a kick out of him still being interested in me as horrible as that it to say. I don't know what to do, we are on too good of terms to completely cut him from my life that would be cruel so please don't suggest that. Has anyone been through this before?
Always one step forward to steps back?
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