I am in a LTR for 4 months, and recently as i already posted here a little ago, i noticed that she liked few pictures of her ex ( not liking pictures of him and his gf ,only few of him ). Now the thing is she doesn't know that i know this and she thinks i don't even know who her ex is. Another thing is that he didn't like a single picture of her.. The thing that keeps me from ending it is the fact that everything else is amazing, sex is great, always texts me for logistics, listens to me, cooks for me. But i really don't like that she is liking his pictures, i myself don't have a single ex on any social media they are all blocked, meaning it is all done for good, not to mention liking them and orbiting them.. Should i set boundaries ( i think this is stupid because she must know what is normal and what is not ( liking her ex pictures is def not normal )), or just ignore this because a like means nothing?