What is up between him and this girl

I have repeatedly told my bf not tot all to this girl we went to school with because of past history. I am so fucking tired of repeating myself. He is petty to the point where he blocks me on social media and thinks I can't see him liking her fucking pictures. Then she FaceTime him about a week and a half ago at 3AM. Like I said I can't continue to be stupid he is not worth it. I'm tired of me being "the pity party of the year" regardless of if we been together for 4 years, I'm tired of wasting time and being so aggravated. If your SUPPOSEDLY not talking to her, why is she still ft you, better yet, why are you liking her pictures of social media. You can say I'm petty, but if your with SOMEONE why can't you respect them enough to cut out the contact. The bitch must be important to you. So therefore I'm out. I really want to keep my mouth shut long enough so he watches my dog while I go on my cruise in 2 days but I don't think I can.