How to not think about it...?

I need things to do to occupy me so that I'm NOT always thinking about this guy! It's kind of ruining my life... When I think about him or I see like a picture or something I get so angry with him(long story).. it just makes me mad, but when I see him in person or I get a text from him I get overjoyed! I don't want to, but I can't help it! I need stuff to do so I don't think about him. When I think about him not only do get all frustrated, but it makes time go by 10x slower when I'm waiting to hear from him. I need TIPS!!!