how do you say sorry?

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One slow night. I was working. My boyfriend was alone roaming the streets of katipunan avenue. He saw one of his girl friends. He told me he was with her. I have always been jealous of that girl. They have been so close. Ever since. I always thought it was normal. But here I am qustioning myself if it is really normal for me to be so jealous. I'm not used to this feeling. We always end up fighting because of her. I don't want to fight anymore. The girl is really nice. She's very friendly. That's probably why I'm so jealous of her, never the less I am. Maybe it's my insecurities. I don't really know what to do. I don't hate the girl. But ugh, my insides boil when I know she's with him. I'm goin crazy. I don't know what to do. Can you help me?