How to not be so insecure?

I’m recently remarried and very happy. I waited many years before I felt ready to take the plunge. My first marriage ended badly and she left me for someone else. My question is: How do I take my insecurities and put them to rest so I don’t put them on my new wife? My new wife is very beautiful and she occasionally likes to go out with her girlfriends to bars to chat and dance. I just need some advice.