Talking about a 3some with my boyfriend

My boyfriend and I have both talked about our interest in a threesome (we both agreed another female as long as we both agree on who it is) and we have someone in mind who is a mutual friend that I met through him (we’ve also talked to her about it some and she’s shared interest as well). Her and I have grown super close and I absolutely love her. They had a short fling a few years ago, which I’m comfortable and fine with, but never actually had sex. I’m very openminded and interested but I’m also a little worried that jealousy is going to creep in, which I don’t want to happen. I love and trust them both but I know how my brain can be sometimes

So if anyone has their own stories they would be comfortable sharing or just tips in general I would greatly appreciate it!