In the past, I had a girlfriend who cheated on me with a girl. It turned out she was bisexual, and didn't tell me until we broke up. This girl tended to be very close to other girls, but I never thought of it sexually.

My current girlfriend swears she's heterosexual, but for some reason I get insecure about it when she hangs out with her friends or stays the night at a friends house. She tends to be close to them like my last girlfriend, in that she likes to cuddle with her girl friends, and be close to them. She tells me that she would never let it go further than that, she would never kiss them or allow them to touch her, etc.

I know she's telling the truth. But I still feel insecure about it. I've talked to her about it, but I'm still insecure. What can I do?