Why do guy so cold hearted?

I just recently been in a big fight with my ex boyfriend, before he’s so nice , sweet and do everything for me to stay with him, Monday we have a trip to Turkey but we got in really big fight and I feel like this time we will never make it up again, he’s so cold hearted, he’s hurting me so bad, I love him so much that I don’t even love myself , he changed so much. Is he not love me anymore?
Why do guy so cold hearted?
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