I want him back?

Me and my ex broke up a while ago and I kind of missed him (or the idea of him I don't know). Recently he started saying some random compliments and even said he missed me (I don't know If it’s as a friend cuz when we broke up we decided to stay as friends but never talked after that or romantically) but never responded to any of my replies. But lately he acts like I don’t exist and completely ignores me.
any advice?
Updates
+1 y
I forgot to mention that me and him broke up because he cheated but now he doesn’t post anything with his girlfriend like he used to so I don't know if they are still together or not
I want him back?
Post Opinion