why exactly did it upset you?

reminds me when quagmire on family guy discovers internet porn

I agree that watching porn is normal.
However, paying £50 at the age of 17, then shouting about it on facebook, is not normal.
Everyone knows that guys watch porn, it's just a fact.
But i can't help getting the feeling that he may be trying to hint at something. Either he's not interested any more, or he wants you to be more adventurous.

Of course, this is just my opinion, and i mean no offence by anything i say.

I wish you the best.

You said you both like your independency didn't you?