Most Helpful Guy
I can tell you for a fact that guys do feel heartbreak. I dated a girl for one month and when I found out that she was getting with other guys, it hurt me so much. She was the first person that I actually had feelings for. But I got over her and im happy right now.
But anyway your ex may just be trying to hide the way he feels in front of you. When in reality, he's hurting just as much as you are. That would explain his behavior with other girls. The guy needs to grow up and stop acting so immature.
Things eventually get better, I promise. Good luck, you'll find someone better!