Is it ok to cuddle with a friend of the opposite sex if آپ are in a relationship with someone else?

I think so, but only if there is nothing sexual going on, like groping یا kissing.

That is entirely something آپ should be discussing with your Significant Other, and depends on the terms of the relationship. سے طرف کی all means, آپ do you, and don't let anyone dictate who آپ are دوستوں with, but do keep in mind the feelings of your S.O. and be courteous and mature about your habits. If s/he is uncomfortable, allow them to express that and don't get defensive about it. Just listen. If s/he has no problem with it, then at least آپ were up front about it and now there should be no confusion.