During this period, I became friends with my neighbour. One thing led to another and one night we ended up having sex. I’m not in touch with her anymore. As of now, I’m going out with a girl whom I met six months ago. I’m in a kind of dilemma as I don’t want to hide anything about myself from my girlfriend. So should I go ahead and tell her that I had a one-night stand with a neighbour. Or should I just keep my mouth shut and hope my past remains buried.
It all depends on how mature she is and how well she can handle it. You say it was just a one-night stand and you are not in touch with her any more. Guess it was one of those heat of the moments thing. Telling her and being honest about your past is good for a relationship. But if your girl is an insecure psycho, she will throw a fit and drive you crazy. She will use it as a weapon to get back at you for the rest of your life. So keeping quiet might be a better option. Both of you have nothing to do with each other. Moreover this happened when you were single and not when you were in a committed relationship.