<human>: So we've had our bumps in the road but overall he's been a decent boyfriend and we've dated for almost 4 years now. 

This happened a while ago, I was consistently finding screen shots from instagram sexy bikini pictures from girls that we both new, I wasn't happy and I told him to stop doing it, to me it was weird that he was sexualizing people I knew, I thought it was disrespectful to me and that I could care less if he watches porn because we do not know those girls. He understood but was stubborn so he fought me on this a lot and didn't really see what why I didn't like him doing it. 

One of the girls that he consistently had pictures of and was always "liking" her photos I unfollowed from his instagram, he knew and didn't follow her back. He then deleted his instagram from his phone and our relationship improved wonderfully! 

Welllll, recently he reactivated it and is still following a bunch of the girls he was keeping the pictures of and even followed that one girl back. I don't know why but all the uneasiness that I had before about him having his instagram is back. I feel like I'm probably overreacting and being petty but this is my bf's first serious relationship and I have had other issues with him on establishing boundaries and being respectful towards me as his girlfriend. I love him, but I don't feel like I should have to be regulating what he is up to. 

Am I overreacting or being petty?
What do I do?

Can you provide a brief overview of the text?
<bot>: Boyfriend reactivated his instagram, I'm worried about him just using it as a spank bank. Pretty over it.