My boyfriend held hands with another girl?

My boyfriend and I are in a LDR and he recently admitted to me that he held hands with his ex-girlfriend and that he has 'urges' towards her. When I asked him whether he would act on them he says he doesn't know. This worries me because it implies that he wants to sleep with her.

He says he loves me and only me and that he only has a physical attraction towards the girl, and that love and sex are separate things to him. So he's basically saying that if he does have sex with her it's only sex and it doesn't mean he loves her. What do I do?
My boyfriend held hands with another girl?
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