Why does it mean when a guy cries after threatening you?

So me and my boyfriend have 2 children and we live with his sister and mom and so one day I was changing my oldest he's 2 and I push him down and he kinda hit his head but I wasn't intending to I just get frustrated and so I had to force him to change his diaper because at times he doesn't want to and so later that day she told him how he hit his head crying and me kinda laughing so he responded to me don't ever do that I'll knock u down and throw u like u did him.. so then I notice I see his eyes were watery but just that no emotion of crying but his eyes did get teary.. did I hurt his feelings? Or what happened

Why does it mean when a guy cries after threatening you?
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