Would you be OK with your spounse spending time alone with an EX?

No! It doesn't matter if you trust them or not. Why would they even ask to go alone? If they have had feelings or been intimate in the past, you allowing them to go is just stupid. You're giving them time to re-kindle that old flame. It's a respect thing. You love and respect your spouse? Then it's simple, you cut off all ties to your love life history. People are commonly blinded by love. They think what they have is air tight and the love for one another is so deep, Satan himself couldn't through. Sure, you're all fine and dandy with it while everything is good between you two. But as soon as sh�t hits the fan and your spouse tries to go anywhere alone with the ex, you'll finally realize just what a bad idea it was. When you're not around what do you think they talk about? Do you think the ex is talking about you and asking how you're doin? No, because they're an ex. People generally talk about the times they've shared together. I personally have never stayed friends with an ex. We were over and that was it. It seems to me that if you stay friends, you still have an interest. Anytime I would look up an old ex was when I was single and wanted to reconnect. So no, exes should stay exes and out of their exes married life. They're no longer in the picture and it will just lead to a disaster. And when married, why would you even want to put your spouse through that? Are they trying to keep on good terms just in case? Never a good idea unless you're looking forward to future heart break. And it doesn't matter if they have kids together, a family member died, they're gonna go into a business partnership, the ex won 6 billion and wants to give them half, etc. If you're not invited or welcomed it's bad news.