I have a jealousy problem?

So about a month ago, me and my now ex had broken up. There were many problems in our relationship but jealousy was definitely a huge one that ended us. I'm overly jealous, I get super jealous don't know why. I thought it was a self esteem problem, but that's not the case. In the beginning of our relationship he was overly jealous as well which I found really sexy and vice versa but that went away over a few months into our relationship. I continued being jealous (and I've made a very big effort to stop, because I knew it wasn't ok anymore) but I'd let him know how I was feeling if I was feeling bad. How can I get rid of this? Or do I just need someone like me?
I have a jealousy problem?
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