Why would my ex husband want to meet at 12 am at a park to talk about visitations arrangements?

My ex called me and told me he wants to talk about child visitation something that we could go over on the phone or meet at a mall foodcourt and talk about. According to him he wants to keep it personal and not to bring no friend or my boyfriend around. Later I got a huge cramp pain in my stomach isnthis normal? Why at at 12am not during day time? I asked him and he just says he likes to keeps things privet.

Why would my ex husband want to meet at 12 am at a park to talk about visitations arrangements?
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