I know not much.
Obviously not... I mean I don't know how you can see Cloud and Tifa shared their mutual feelings for each other and say "Square left it ambiguous". I mean they're living together and raising a family and Cloud said in CoT that he had Tifa with him and it was different before. I mean really, what more do you need? You KNOW Tifa loved Cloud at that point... mutual means he must have returned the feeling...

But from (what I believe to be) an objective standpoint, I'll argue that Cloud's affection really was intended to be ambiguous.
In FFVII sure, maybe, but after everything that's happened, I don't know how anyone can say that. I really don't, I mean what do you need a kiss? A hug? Why do you need those things when you can say it's possible he loved Aerith and he never did those things with her either.