Why is my ex boyfriend a jerk?

He broke up with me saying that his parents arranged a marriage for him and that he will not marry me in the future. It was an ugly break-up... he borrowed money and hasn't returned it back to me. He is not working, as he is pursuing masters degree. All he does is playing dota and mobile legends. We already block each other in any social media so we only text in email regarding the money. However, i feel so upset that he rarely responds to my email. He said that he would return it last week. The money never came. I try to ask him politely, but he only responded one paragraph, not even saying sorry to me that he couldn't transfer. I don't ask anything from him, I only asked him to update me about the money matter... Why is he so annoying?
Why is my ex boyfriend a jerk?
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