Is it ever OK to keep a secret from your ex about something in the past?

It depends, if it is something that involves your spouse or partner, I would say not to keep it a secret, it is better if they hear it from you, then they finding out about what you did. If it is something you did before you met them, then it is up to you to reveal it or not

I don't keep anything from my husband. Sometimes these issues can come back to haunt you, and if you don't tell them up front, they could look at it as a lack of trust. I prefer to get everything out in the open, especially if it's a mistake that I've made. Everything comes out in the wash eventually. Secrets have a way of coming out and could cause irriversable damage to your relationship. It isn't worth it. Your title, however, asks about keeping things from your ex. My ex is my ex for a reason and what I do now is none of his business. When we were married I was open with him, but I haven't talked to him since.

I personally believe it's ok to keep something (that happened in the past) from your ex or your present, if it's something you wanna forget about... to embarassing to share...traumatic for you just to mention it. Why bring up something if it will only awaken unpleasant memories (in you or about you) and might even stir you up... unless you are disturbed by it. There are things or events in our lives that we'd rather keep to ourselves... for whatever reason we may have.

Of course it is. They don't need to know everything. If you feel that they *need* to know, then tell them. But really think about it first.

That depends on the secret. Your partner doesn't have the right to know everything in your past, and some things are better kept under wraps. The big question is how you handle keeping it a secret. It it is something that affects the way you think, behave, and feel, then you might be better off talking about it so your partner understands where you are coming from. It it's something like "I slept with your ex-roommate when we first started dating", I think it's better to keep it quiet. I look at it this way - "Would I really want to know if the tables were turned? And will it help our relationship to tell the secret?"

if it has anything to do with him or can affect him if it gets out,tell him.if not,dont.

There is nothing wrong in it. Sometimes, telling the past may spoil your relationship. If there was a mistake in you past and you have realized and promised yourself not to do such, there is absolutely no problem is not revealing your past.

This could go both ways. There're partners who would deal with the information and your relationship would still be on track but there're others who would freak out and the relationship would hit the rocks. You just have to be sure what category your partner falls into. Personally, i would prefer to tell my partner but if i know she's going to freak out and cant deal with it, knowing that i dont want to lose her either, then i'd rather not tell her.