You can tell a lot about a person by what they do after hurting you. Some apologize. Some reflect. Some change. And some will rewrite the entire story in their head just to avoid feeling guilty. Accountability is rare because protecting the ego is easier than becoming better.
It's so selfish to enter someone's life, see that they're a loving, cheerful, and good person, and decide to ruin their peace because you haven't dealt with your own issues. Leave people alone if you have no intention of showing up with sincerity.