<human>: Condense the text into a few key points

my boyfriend and i were on a break about a year ago due to unrelated reasons. we both saw other people and had a rocky relationship/friendship/whatever with each other during that time.

in that time i was casually seeing this guy "Trevor". it wasn't anything serious and at the end of the day, we decided not to become more serious and that was that. we ended fine with no hard feelings. figure that was about 2 months we were seeing each other? at most?

cut to 3 months later and my boyfriend and I are back together. everything is good. we had our issues but we're happier than ever and i can't complain...except, my best gf, "Erin", started dating Trevor after me and my boyfriend had been back together like 6 months. she wasn't initally going to initiate a relationship, but i realized they both liked each other and i didn't care one way or the other, so with my apathy they started dating.

issue now is, my boyfriend feels uncomfortable with the idea of Trevor and only recently has Erin/Trevor moved closer where i'd see them more regularly. so it's been this weird tightrope walk of coordinating hangouts with Erin (if/when i know Trevor will be there) and with my boyfriend. this is further complicated by the fact Erin and my boyfriend have and continue to be friends (though less so now than before they started dating). even when we had broken up, they stayed close and stayed friends.

is it inconsiderate of me to maintain my friendship with Erin? was i wrong in not veto-ing the relationship on girl code? should i appease my boyfriend and phase Erin out? can i get my boyfriend comfortable?

while we have discussed it before i'm looking for outside insight or opinions. i'm sure i can't be that only one in this type of situation...i think lol. help a sister out.
<bot>: best friend is dating someone i used to see casually and it's awkward getting together because my boyfriend feels weird about it.