You're reluctant to let down your guard with a newcomer. This is a wise decision. Someone who continually pumps you for information has ulterior motives. It's best to keep your own counsel. When asked probing questions, it's perfectly acceptable to say you are not comfortable responding. There's no reason you should reveal personal information to a neighbour or colleague. If your reserved attitude comes off as cold, that's not your problem. You have plenty of confidants in your inner circle.