I can understand your doubts. Every relationship I have been in has doubts, because it is human nature to be suspicious.

What makes love so wonderful is that doubts can be overcome. Your partner has told you it is nothing and I think your love and trust for your partner should make you believe that.

There are things in my marriage that my partner doesn't know and there are things that I discuss with my friends that I wouldn't discuss with my wife (or in front of my wife for that matter!)

It could be something as innocent as a suprise party.