Why do people get back with someone who cheated on them?

My brother has depression and an urge to date women. He`s a 22-year-old college student. He dated this girl for a few months who I did not like very much. She isn`t very pleasant, she never finished high school, has a really crappy job and she has some serious mental issues, not to mention that she is a foster child. She ended up cheating on him and he told me he blocked her for good and was tired of everything. A few weeks later he is suddenly back with her.

This whole situation is crazy because he never tells us who he dates and what they`re like. Why would anyone get back with someone who cheated on them? Why can`t he find any good girls?

Sorry for the anger guys I`m just really disappointed in my brother.
Why do people get back with someone who cheated on them?
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