Sqad - I used to go out with someone who didn't treat me very well, he was enotionally manipulative and just plain nasty sometimes. He did have a nice side too which is why I stayed with him so long. When I first went out with him I thought he was exciting and dangerous and it was fun but I soon realised he was a ******* to women too. I now want a nice man who I can settle down with.
Lucy, if you have a good relationship now I would highly recommend that you don't forfeit this by letting your imagination about this man who you had a fling with 4 years ago. It is a long time ago, you cant have known him terribly well if it was only a fling and besides he might have changed. I know its not as easy as that to just forget him but you have to keep trying. Just focus on your boyfriend and how you can make your present relationship great.