I pair my partner up with others

Does anyone else do this? If we are out and about and we see a girl who looks like she'd be his type i think to myself "Omg theyd be perfect together, I think he would really like her" and then start feeling insecure about myself. Or if we meet someone who has similar taste and hobbies than him I think that he would be better off with her and not me? Why am I always doing this. It's annoying 😭