Why do guys hold on to grudges?

Anonymous
My ex and I broke up over a year ago. He ended things because he was stressed and the relationship put to much stress on him. I was heart broken. I really cared for this guy and enjoyed being with him.

I thought enough time had passed and wanted to befriend him again, so I sent the Facebook request the other day and...He just blocked me-just like that!. I thought after so long he would let go of this grudge he still has with me. I don't know what I did, if I even did anything.

Since the break up, he has dated a few people, and I have been in a relationship for the last 9 months.

To my knowledge, I didn't do anything to hurt him. I gave him his space like he asked and when I saw him out I would say "hi, how are you? It was good seeing you. Enjoy the rest of your night. " small talk.

With that said,

1. Why would a guy hold a grudge against someone this long when he chose to break up?

2. Do guys -knowing they hurt someone, regret it? Typically girls feel bad when they hurt someone relatively soon after and want to make amends. Just wondering if guys do to, or if it is something that they can brush off.

Why do guys hold on to grudges?
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