Okay so my (M21) Fiancée (F20) wants to have a poly relationship with our very close friend (M21). She’s been in a long-term poly relationship before and knows people that had similar doubts and worries, but ended up enjoying the lifestyle and have continued long-term relationships. However, I am very anxious about it because I have never done anything like that and I don’t want to make things weird between us and lose them both. I tend to overthink a lot of things even to the smallest detail, and don’t want to end up getting jealous and ruining it. I want to give it a try but I don’t at the same time because I am scared I would do something to mess it up and I don’t want to do that. I have done a little research already and my fiancée has explained it to me as well but I just keep finding my self getting more anxious I just don’t wanna be the reason that it doesn’t work out.