I'm jealous of my boyfriend's female friends and I hate it. Am I Nuts of Naive?

Anonymous
I know jealousy is ugly but I can't help but feel jealous when my boyfriend of six years has been making plans and hanging out with girls that I don't know. I know it's pathetic but I feel like he is looking for a replacement for me. We recently almost broke up when he had looked through my computer and found my personal journal that I ranted in when I was p*ssed at him.I did this because I needed to write things down to rationalize my feelings as I'm a private person and don't really talk about my relationship with my friends because I want them to not like my guy.

In one of the journal entries, I spoke of being away from him (several years ago) and seeing a old friend at a party who I felt guiltily attracted to. I didn't do anything with him I just felt guilty for even thinking about him in that manner since I had always been super loyal to my boyfriend. He read this and took it as me cheating on him, and a month later when he was giving me what I took as the breakup speech about him feeling not himself and needing change, blurted out what he had read. We both just graduated college and had moved home while saving some money we had been staying at one of my family members house right after the "Break up speech" he moved in with him mom. Now I find it funny that he has been pursuing females as friends. But then again it's always been this way, he's always had female friends his best friend is a girl and he has only few male friends. I find it strange that he lets me hang out with his male friends but not his female friends. Lately, he's been hanging out with his coworkers who are all female several of them are rude to me when I stop by his work. He's hung out with them about three times at their house (they all live together) and I wasn't invited or allowed to come. He also plays music with girls, and one in particular on his breaks between classes. Today he was teaching a girl how to play guitar for a few hours even though I was also on campus with nothing to do and we had plans to get coffee which he denied. This coming weekend he's going golfing with a girl from another one of his classes who's 18 since she has a membership at a nice club and it will be free for him. The girls from his work text him and call him pet names like love, and he talked to one in particular about our drama and then lied about who he was talking to claiming it was his brother which made me mad since they will now never like me because they think I'm a cheater. I always invited him around with my friends both male and female. I feel like he tries to exclude me from his life, but he insists he loves me and spends a majority of his free time together. Asks me to stay the night and visa versa. Is my jealousy justified?I don't want to be that crazy girlfriend but I feel like he's pushing me away and I don't want to stay if I'm genuinely not wanted which he claims I am. He says "If I wanted another girl I wouldn't be here would I". Please tell me if I'm being a loon.
I'm jealous of my boyfriend's female friends and I hate it. Am I Nuts of Naive?
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