Why is my ex upset that I unfriended him on Facebook?

He broke up with me a few days ago because he was afraid of getting hurt. I did something a few months ago to damage his trust, and our relationship hasn't been the same since. Plus we had a few other problems. He said he is still very in love with me (and I know for a fact he was) but it just wouldn't work.
Anyways, I removed him as a friend on Facebook and he Texted me all upset a couple days later "why did you delete me? :'("
Why does he care so much if he's the one who broke up with me?
Why is my ex upset that I unfriended him on Facebook?
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