Hey,
I'm no expert when it comes to relationships. I've had my share, but when you know it's right...it's right. I recently had similar problems where she was scared cuz I reminded her of a couple of ex's. We sat down in neutral territory. We just had a "conversation". I expressed my feelings. She expressed hers. And I expressed that I am NOT her ex's and that I am a GOOD person. That she doesn't need to fear me or relate me to the ex's. It worked....it really worked. Now we are very open, less strained. I believe in transparency to it's utmost, honesty, and above all...look into his eyes and vice versa with undivided attention and tell him what he means to you....and how you appreciate him ....He should get the message.