Most Helpful Guy
Guys deal with it different than girls because. . . there's a difference between men and women! And not every guy deals with it the same. Some guys retreat into a cave and come out only to go to work. Some guys run out and find another woman right away. Some start drinking more. Some hang with their guy friends more. Some guys want to make a girl think that it doesn't phase them a bit.
When my ex-wife and I separated, I spent a bunch of time trying to talk her out of it before I move out but, once I moved out, I never said another word to her about reconciliation. I started dating right away, but I was never in her face with it. I didn't date to make her jealous; I dated because I really thrive on the attention and affection that a good woman can provide to me.
He doesn't want you thinking that you have some power over him, so he acts like Mr. Cool. But then he has moments of sadness and regret, so he reaches out and says kind things, hoping that you will show some kindness and some sign that gives him hope for reconciliation.