<human>: Can you succinctly summarize the text in 1-3 sentences?

A little back story: 

Last year, I met Aaron at a concert briefly. We talked for a couple minutes and then dismembered. A couple weeks later we met in line at a different concert. We exchanged numbers and started talking.   Earlier in the month I had met Stefan and when Aaron and I met, we sort of had a thing.   Anyways.  Stefan and I weren't dating yet, and I didn't know if we were going to or not.  

Aaron liked me and was trying to pursue me.  I said no at the time due to age (I thought it was kind of a lot at the time) and ended up choosing Stefan.  Aaron and I continued being friends and he was there for me through everything.  Through the hardships Stefan and I faced, etc.    He's been a fantastic friend and has been nothing but loyal.  

Since Aaron had feelings for me at one point, Stefan didn't really like him and always had a sense of hatred towards him and was always very leary of him.   Eventually, after Stefan and I broke up, they mended their friendship and are now actually friends.
 
Now Aaron and I are dating.  Which leads to last night.  I found out that Stefan is here in town (He goes to school in TC, Michigan) and asked Aaron to hangout yesterday.  I feel so sick to my stomach.  Aaron and I talked about it and he knows how upset I am over it. He didn't hangout with him and he said he wasn't going to.  I hate that they're friends and I feel selfish. 

Is it wrong of me to not want them to be friends? Keep in mind, this is someone that emotionally abused me and gaslighted me.  He's a narcissist.
<bot>: boyfriend is friends with ex boyfriend and ex boyfriend is here in town and wants to hangout with my current boyfriend. I feel so sick to my stomach. Is it wrong that I wish they weren't friends?