Still stuck on my ex..

hate myself for it but for some reason i still care about him. we broke up in march but we just decided that it was best for the both of us to stop talking all together about a week ago. he would talk to other females while we were together and lied to me about just about everything. he didn't start "changing" until we broke up but i was still very indecisive about getting back together. anyway, today i was scrolling through instagram and saw a picture he posted of him, his friend that he always claims was never a real one and always complained about to me. and then three girls all in some very revealing outfits. what bugs me the most is he posted the picture in the first place. he always never wanting me to wear clothes like those girls were. & also the way he was w the one girl on his arm made it seem like they were a thing. & not once when we were together did he post a picture until almost a year after us being together. to add he tweeted, "don't stunt till it's official" who the hell moves on that quick?! please someone tell me. i want to say something so bad but not even sure it's worth it. ugh i hate that he did this.