You can start dating again whenever you want, but if I were you, I wouldn't just ask out any other guy. Wait until you find a guy that really intrigues you, or if another guy asks you out, then say yes, give him a try! You'll never know what's out there unless you look. As for you not being over your boyfriend... maybe seeing other people will make you feel better about it, or maybe you just need to wait awhile. If you need to wait awhile, I'd wait until someone else asked you out. But if you don't need to wait, what the heck! Ask someone out!