Nothing wrong with being human and enjoying a little positive male attention. You should not feel guilty about this. That said, your life is incredibly complicated and tumultuous right now. Perhaps waiting a year or two and letting things cool down and gel would be best for all. In the meantime, use that time to sort out your life, get the divorce and custody settled, and work on yourself in counseling, etc.
I can sooo relate to this longing for someone. I have a similar attraction with someone. But I've decided to turn my back on it and focus on me and really getting comfortable in my single skin.