Jealous? Insecure?

I need help trusting my fiance. I am very insecure when it come to his female friends or any females around him in general. It's not that I doubt his love for me but he's very friendly and I never want someone getting the wrong idea. It was getting so bad that I'd look through his phone without asking and after several fights about it he feels I don't respect him (because he always asked me to ask to see it and I never did) so he put a password on it now. It makes me get angry with him without really a reason? But my mind makes up reasons too... Idunno.

Anyone else ever feel similar? Am I crazy or is he?