Having children is normally one of the first things you discuss when getting into a serious relationship. Not with each other, but if you have your own. It is an important factor that couples have to understand in order to determine if the other person is the right one. Why would he wait until a year to tell you? I understand not wanting to tell you on your first or second date, but once the relationship got serious, I would think he would have mentioned it to you.
I would question the honesty and trustworthiness of this guy. Be cautious.
Good luck.
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