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I'm still friends with two of my exes, so in my personal opinion, I don't see anything wrong with it. You probably won't even talk all that much. My one ex is married and has a baby, so I never hear from him, and the other I chat with kinda sporadically. If you, your s/o, and your ex are all chill with it, then there's no harm.
All up to how you feel, and what he thinks can happen in the future. I totally love one of my exes. He is remarried and I also moved on, but we both do love each other. We are just not in love with each other. There are a couple exex that would think that I was reopening the door so for them I stay away.
It depends on the ex. I'm actually friends with most of my ex's, going all the way back to guys I dated in high school. There are really on two that I don't care to ever hear from again. If you can maintain a friendship, great. If it makes you uncomfortable, then you definitely aren't obligated.
Do what you feel comfortable with!