Man's nature???

Long story short, me and my boyfriend got to our friend house and got drunk. After some time we got into talking about clubbing and he said "I wish we met three years later so I could have had an opportunity to go to clubs and get girls around me". We all laughed but he seemed pretty serious and after few hours I couldn't stop thinking about it and I felt extremely bad.

At one particular moment I started crying and I went outside by myself and then my friend came after me and I told her everything and she asked me if she could ask him to come. She went back to house and I heard him talking with them and he was almost shouting that he didn't do anything wrong and he won't apologise.

Anyway, I absolutely understand that I have overreacted and that is because I was drunk, but it still hurts me as I am sober.

Then we both went home with bus and while going he cuddled me and asked what's wrong. I told him why.

And then he started talking about man's nature.

He said that he appreciates my every single gesture, touch and kiss, he loves me with all his heart and would never leave me because I am his whole life. But then he said that it's in every man's genes that whenever he notices a hot girl, he immediately wants to fuck her, no matter if he knows her or not. And he says that it's just that immediate passion of wanting to fuck and afterwards just never talk to her again, because he loves only me and stuff. He said that he absolutely understands that it would be over if he cheated on me and he said that it's all only his thoughts.

And I said that it's alright and I get it and he said that he's happy that he had an opportunity to talk about it.

I mean... I probably don't have a right to be mad at him because he said nice things and it is just his thoughts. But I truly don't know how to react to it and I'm so very very confused..

How should I react? What should I say to him? Is it okay and is it really every man's nature? I can't even do any housework because it's difficult to concentrate and to not think about it.