Bisexual Problems

I have been dating my boyfriend for a while now and he knows I am bisexual and that I’ve dated girls before and had sex with them. Lately because him and I haven’t been having as much sex I’ve been having sexual fantasies of girls and doing things with them and I would love to have a threesome with him with another girl but I get jealous super easily and I don’t like to share. It would be nice to feel someone actually eat me out and make me finish because he doesn’t really eat me out. I guess i’ll never really know what it feels like again to be eaten out by a girl and finish and do the same to her. Unless anyone has an suggestions to help me get past my jealousy and have a threesome & how to find someone who will have one with us.