What can I do to be less jealous of my boyfriend?

Anonymous
I get jealous if one of his ex's likes his picture on Facebook,if he talk to a girl he was with or had 'something' with more than friends. Sometimes I even get jealous when one of his friends talks to him while we're out and she's single and pretty. We've been together for over one year... I was not jealous in the very beginning of our relationship I only became so jealous later on but sometimes I feel that my jealousy could break us up. I've tried many times to convince myself not to be jealous but I keep blaming his long history of being with many different girls and having lots of ex's to be the reason why I'm jealous. I am a bit insecure of myself, I am. But this is actually my first ever relationship whilst (although the most serious and longest one for him as he said it himself), it's not his first. I love him and I want to be with him forever cause I'm sure he's the one. But I can't get myself to stop being jealous. What should I do? How do you make yourself less jealous? :/
What can I do to be less jealous of my boyfriend?
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