Why would a man who’s friends with benefits with a woman all of a sudden start treating her differently in a bad way once he found out she had cancer?

Clueless27
My female best friend who’s 32 has been friends with benefits with a 48 yr old man for 3.5 years now. She recently found out she has stage 1 bone cancer and has finally told him. All of a sudden he just started acting distant and had a change of character ever since, why would that be?
Why would a man who’s friends with benefits with a woman all of a sudden start treating her differently in a bad way once he found out she had cancer?
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