Been with DP 2 years, LDR. So I've been looking at the fb page of a girl he's friends with (we all share a common interest but I don't actually know her) and I've noticed he either 'hearts' or comments on pretty much all of her posts with some sort of mildly flirty banter. I've mentioned to him before that he doesn't accept it when I tag him in stuff and he says he does accept it but doesn't know why it's not showing up on his wall. Sure 
So I've been looking back at my fb this morning and have noticed he's not like any of my posts and might have commented on maybe one since we first started talking which makes me wonder if this is the kind of 'chase' thing he does? This girl is engaged so I can't see anything happening but I'm pretty sure they talk every day (he's on his whatsapp all day long talking to male friends) and I wasn't jealous one bit of him having female friends until I found out recently he'd cheated on me last year. Sounds like a right catch doesn't he!
Would you feel paranoid like I do or would you assume it's just banter? I'm so close to ending things with him for other reasons too but I don't know why I just can't seem to 