Why do men not want to commit but get mad when u move on after they say they don't mind bcuz u r just friends?

I am currently involved with someone who doesn't want a commitment at the moment. I have been involved with them for quite some time. After many months of heartache I have decided to see other people. Of course now that I am seeing someone else (guy 2), guy 1 is now upset because I have reduced our relationship to a platonic one. Now he is saying he wants a commitment but I think it is because he just wants me to wait around and not talk to anyone until he is ready to be commited. Unfortunately for him, I'm not one to put my life on hold for him anymore.