Aurelie, I am so happy for you.
Honest communication + love + compassion works wonders!
That being said, it doesn't mean he won't ever feel insecure again, or that no one will make mistakes, but you've taken huge steps toward working things out and deepening your relationship. It's great that he wants you to teach him things to do with you sexually that he's never tried before. I think that, as long as you treat that as something of a loving adventure, it will make things between you 1000 times even more wonderful! I agree that you should wait a bit before introducing the two of them to each other - even a few months, if need be. I would wait for your boyfriend to settle into this newer, more secure place with you, and for his confidence level to rise, before adding another element that might throw him off.
Good job, hon.
The world opens up... when you do.
Oh, oh, can't you see? Love is the drug for me. ~Bryan Ferry
"Love is that condition in which another person's happiness is essential to your own." ~Robert Heinlein