Help me get over him.?

Right so me and my ex just split up. I've spent about 6 days being angry then sad then angry again. And I just want to stop now. I've been able to have laugh with friends thankfully but it's very difficult.

He was flirting with another girl before we broke up and the day after someone told me she had love bites... not sure if their is something going on. Not sure if I want to know.

Now I'm finding it a little easier. Only a little. But I keep being reminded of him... is their anything I can do when I think of him that will help?

Also, I have to see him most days because we are on the same college course. We have the same friends... which of course makes it hard.

I have done something very bad all week by messaging him and asking him stuff about his relationship with this girl and stuff. I know that that's wrong now but I can't change what I did. I also asked him not to go to a friends party because I wanted to go and didn't want to see him there. He was quite mean when replying but that's actually helped some because yes I get upset but it just shows me that he is a jerk.

So any tips? Thanks for reading... sorry it's so long.