All the guys that I have been in a relationship with and cuddled seem to shiver when I'm cuddling them?

I'm still in highschool but I have been in a few relationships. I've noticed that everytime I've cuddled with any of them they start shivering and it's not like it's just cold? I have never seen them shiver like that unless I hug them tightly or cuddle very close, I'm just wondering if this is something guys do and what does it mean or if I'm doing something wrong
All the guys that I have been in a relationship with and cuddled seem to shiver when I'm cuddling them?
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