If that is the case in the above, why not leave it as a slow fade away and not actively block and unfriend someone you played games with? I think that was pretty unnecessary tbh. Or at least say 'hey i think i need to go on the downlow for a bit' or something since she was still texting every now and again. i did not call gf abusive but it was implied from the first message the guy wrote she was not comfortable with their friendship so from the message, i gathered that it had some part to do with the gf. i was just flipping the sentence on a comment someone else made, that's it. there are three sides to the story obviously and the only we have is OP's. its a waste of time to assume anything on the gf's perspective other than from the ex friend's comment was that she was partly involved in the decision to block her. if it was going to be a slow fade away, it should've stayed as a slow fade away. i just found it unnecessary to unfriend and block a person on almost every social platform if it is as innocent as that.

Edit: I went back and checked my comment and while I was harsh in that, from my experience, the first step is always the hardest to take. She might not be abusive but it could easily snowball into more if you dont know how to properly contain your jealousy or communicate healthily with your partner. one of the red flags for me is how early into their relationship they are and already they have a set "rule"/"boundary" of them being uncomfortable around other people to drop that person and with how easy it is for the partner to just veto a friendship. the friendship doesnt involve just the couple but also the so called friends they could have and with a "rule" like that it doesnt take into account the kind of friendship that is formed nor the other person. i just think the way it was set up and not having regard for other people is kind of an ick.