Guy hates a girl but?

A guy went on a date with a girl with the hopes of having a brief fling with her (sex fling for 2 or 3 weeks with no intention of having a relationship) but she didn't kiss or have sex with you and instead seemed like she wanted to date/relationship. The guy gets mad that she didn't kiss or sleep with him so he ghosts her and never texts her again and starts seeing other women. Then why does he have her number? Would you keep the numbers or delete it? PS he was angry, upset and really rude to her afterwards but wouldn't stop talking to her either , in person. However , he has no intention of meeting her, texting her so why keep the number?
Guy hates a girl but?
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