Threesome

Hi everyone! Okay so, I need some advice. I have been with my boyfriend for 8 years, we've had a great sex life, and in the past two years or so we have been wanting to spice things up in the bedroom and try new things. We've tried a couple different things, incorporating toys/food, watching adult films while having sex and experimenting with new positions, which has been really fun. But recently while having sex he mentioned he wanted to have a threesome. Most women are hesitant about this, and trust me I was a bit. I told him, although I think it would be fun I dont know how I would react or if my jealous side would kick in seeing him fool around with another woman. He then proceeded to tell me, it doesn't need to be a woman, we could try it with another man. My initial feeling was confusion, if I'm being completely honest. Most men fantasize about threesomes with two women, but very rarely have I heard about two men.

A lot of thoughts went through my mind: Does he not care if I sleep with another man? Does this mean he doesn't truly love me?

So, I asked if he wouldn't be jealous of me having sex with another man.

He told me he likes seeing me get pleased, and he would really enjoy watching me be pleased by him and someone else, it be a man or woman.

I played around with the idea, and think it would be a lot of fun, and exiting, but I can't help worry a bit. Will I even enjoy it? Will I not be pleased or will I not be able to please him sexually after this experience? Will it affect our relationship in any way? Maybe in the heat of the moment everything is great, but after that "heat" cools off, will his true feelings will come out?

I would love to hear your advise. If you've been through this or have heard from other people, or just your thoughts on the subject. Let me know!