I met someone and my ex doesn't have a good co-parenting relationship with me?

I met someone and I haven't told my ex anything. Right now things are tensed with my ex and I due to communication. I'm afraid my ex will go crazy once he knows I'm involved plus he's married. I haven't told my kids anything nor have we introduced the kids to each other etc.

How to deal with this situation? Should I wait until things are serious with my partner and I before telling my ex?
I met someone and my ex doesn't have a good co-parenting relationship with me?
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