Jealousy and PMS

I hate this time of month. I get so edgy, irritated, and the least little thing sets me off. My boyfriend and I had a fight over him adding a girl he use to date on his Facebook. It got so bad, I deleted my account. I wouldn't have gotten so angry any other time, but my jealousy skyrockets right before my period. I guess what pisses me off the most was I asked him to stop talking to her when we got serious about our relationship about a year ago. Our deal was "no exes on our Facebook". I'm so annoyed and really I don't guess I should be. When I have a problem, I know the solution is to change something within myself. But it's so hard. My insecurities are at an all time high right now :(