Cuddling is not always a romantic thing, it can be completely platonic, it really depends on the person and the relationship. If he’s ok with you cuddling with another guy than that’s ok. If you are ok with him cuddling with another guy then that is just a double standard and the you can’t have opposite sex friends type of behavior if that is the case. I don’t know the whole context but that’s my take varying on the context
Cuddling is cheating? Oh no please don’t cuddle me! I haven’t lost my cuddle virginity yet! It really depends on the persons intentions and if it was romantic or platonic. A hug for example can also be romantic or platonic, but you can’t just assume they are cheating on you for hugging someone close to them, it’s too much of a grey area