Guys, do you hang out with other girls one on one?

I've been dating my boyfriend for 3 years. We are adults.. I trust him but I don't like when he hangs out with his girl friends one on one. I just don't get it. I have great guy friends but I don't go out for lunch with this or do activities together. I have no desire to. Group hang outs are suffient for me. This does create a lot of strain in our relationship. I know the friendships are completely platonic and I do like his girl friends. Im not threatened by them and I can't figure out why it bothers me so much. I also don't see other guys hanging out one on one with their girl friends... HELP. I'd love some perspective on this because Im struggling with it.
Guys, do you hang out with other girls one on one?
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