Threesome advice

So I've been dating my man for five months. He is 26 and im 22 if that matters. I have always been bi-curious, but i havent had the experience yet. He has been in a threesome before. He wants to see me explore my natural sexuality together.
Anytime i think of another woman with us i automatically get nervous/jealous because ive been cheated on. I know i am beautiful and he cares about me only. Just aprehensive about it for now but the thought if it all intrigues me.
The possible third person we have talked about is a lady he knows that likes him. And a woman he has slept with once. 
They are both attractive. Should we find a new candidate completly or will him knowing them already make it better?
Tips, advice, criticism is all welcome!

Glow Resources

Let’s Glow

Glow is here for you on your path to pregnancy

Glow helps you navigate your fertility journey with smart tools, personalized insights, and guidance from medical experts who understand what matters most.

25+ million

Users

4.8 stars

200k+ app ratings

20+

Medical advisors