He can't be in the same room as his ex, does he still have feelings for her?

I have been seeing this guy and I know his ex. The thought of her makes him really upset and if she ever happens to be in the same place as him (bar, grocery store, restaurant) he has to stop whatever he's doing and leave. I feel like either he still likes her but she doesn't want him, or she did something pretty terrible. Whenever he talks to me about her (which isn't often) he refers to her as that whore, and she just makes him so angry. We haven't been together that long so I haven't really asked him about it yet, they haven't been together in years. Do you think he still has feelings or he just genuinely dislikes her THAT much? Thanks.
He probably still has feelings for her.
He is probably just hurt because of her.
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He can't be in the same room as his ex, does he still have feelings for her?
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