I just don't know what to do. How do I forget this man and sort things with my DH?

[vconfused]

I have used MN for years and it's the only place I can come to where I see sound advice when I can't talk to my friends. I am hoping someone will be able to give some advice.

My situation is that I am married with two children. Things started to go wrong between my husband and me about 18 months ago. We had various pressures on us and we broke up for a few months recently. Our children continued to live with him for various reasons. Now I live back at home, mainly for the children.

A few months ago I became involved with another man. He is not suitable for me at all and has emotional problems, but nevertheless I have fallen for him a little bit and I can't get him out of my mind. I have finished contact with him so that I can try to get things back on track with my DH. This man was into me, but I think was hoping that I would dump my family, and that is never going to happen!

I really want to fix things with my husband, I don't want to be with this other man - but how do I stop thinking about him? I know I would never be happy with him. And I want my DH and children and I to be a family again but I don't know how to un-do all the damage...
Any advice?