get my boyfriend back

Well…Me and my boyfriend broke up about 3 weeks ago(5th november), He said he wanted a break between us because he did’nt think we were working out to good. I did’nt see what he was talking about i thought we were going well. A week later he got a new girlfriend, I was shocked but i knew i had to acceppt it though, But i really like him still and it really hurts to know he’s got someone else now.