<human>: My SO (17F) and I (17M) have been dating for four years. We had a small breakup a year and a half ago during which time my SO started talking to another guy who had previously shown interest in her. She and him were flirty and talked a lot over the month we were broken up. We got back together and she stopped talking to him, except for the occasional text to say "hi". My girlfriend has recently begun talking a lot with him. They even hung out multiple times in the past week to "watch netflix." I trust her with all my heart, but I still have suspicions and I feel weird about the whole situation. The guy is very attractive and funny according to her and some of our other friends. Additionally she has stopped doing anything sexual in our relationship. Even though we had never had sex, we often performed oral on each other and had fun other ways. She has since stopped doing so for about four or five months. I'm not sure if she just doesn't like it anymore or if she has found another outlet for it. She also never mentioned it to me at all until a friend saw them together at a restaraunt.

Summarize the given text in a few sentences.
<bot>: SO has been spending time with attractive male friend with whom she has flirted with in the past. Should I be worried about it?