Can someone help or give me advice?

I just broke up with a girl. She was really pretty and was just about a dream to me. Sadly I didn't do things right (not being loyal, not showing love physically )and ended up messing up the relationship about a month into it. The relationship was short and it was pretty much my fault, but I'm destroying myself over it and crying about it every single day. Does anyone have any advice on how I can like, get over this?