How can you tell the difference from a guy distancing himself because he no longer likes you vs he likes you but is trying not too?

What would be signs between the two? Is it possible to tell?

How can you tell if he’s just changed his mind and no longer likes you vs he still finds you attractive but knows he can’t be with you.

Context is you both have partners, liked each other in the beginning but know it cannot be.

How can you tell the difference from a guy distancing himself because he no longer likes you vs he likes you but is trying not too?
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