I am guilty of doing it. Most of the guys that I am attracted to share many features with my ex. I can't help it because that one of the many features that attracted me to the guy in the first place. You won't realized it until someone point it out to you. I mean I would be attracted to my current flame but can't it but be amazed that I find a guy so similar to my ex.
lol I have to say I have a habit of doing this I don't know why its just the kind of fella I find attractive I dated 3 fellas who all looked the same pretty much anyway the last one I dated I knew straight away he looked like my ex because I pointed him out to my friend before I knew him to say oh doesn't he look like my ex and I ended up with him I was attracted to him at 1st because that's the look I like but after a few days I was able to see how different him and my ex were and I started liking him for him and could no longer see my ex in him