Have I changed?

I was in relationship for 2 years. She was a sick girl. she used to suffer from seizure. I was always a kind boy so i always used to extra care of her. I even went the same college as her because she said she will be relieved if i was with her.
I never used to get angry with her because she was weak and ill. i used to love her a lot. But we broke up because my caste was lower and her family didn't accepted me. But she still wanted me to say beside her as a friend which i did. But lately i get anrgy at her. Thinking the past makes me angry. I want to leave her but can't. Even if i try to convience her she doesn't agree. I get angry with little things nowadays. she says that i've changed. Have i?
Have I changed?
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