Of course a man thinks of his ex when they break up especially when it involves a child or if they were in love. I broke up with my ex almost 3 years ago but I still think about her from time to time. I wonder how she is doing and how is everything in her life. I wish her only the best and who ever she is with I hope he makes her truely happy. You have to remember that the one thing a person can't run from is his or her memories. All the good times we've shared still pop up in mind like it was yesterday. Which makes me miss her still. Emotionally, we men are the same as you women. We just tend to hide it better, due to our upbrining.
Off the topic here, women are what make good men into players! Every good guy I know or talk to say that once they are burned by that one specially person; that one he loves the most. He becomes a lousy, low down, dirty dog! You see, told you women are evil! Hahahahha, just joking everyone.
Your mind is your greatest weapon...