I have been dating a guy for 3 years and I question whether he is gay and in denial?
I don't want to stereotype but he has emotional detachment issues and social anxiety (of which once he quickly and abruptly walked out of a store when a gay person was serving him), he is quite manly but on the odd occasion he walks and bends the wrist. He also has a bit of a lisp (not too bad). He loves cooking, especially cakes (which he has taken to his guy friends place). He also has not had experience in past relationships and is 30 years old. Is he gay?
I have asked him and he said No, however when I wanted to elaborate further as to why I thought these things - he said he does not want to discuss this further.
He is good in bed, although not emotionally connected, although he loves me.
Is he gay?

I think he could be!

Being a Christian I used to believe that being gay was a choice... and that gay people could change if they wanted to. But I watched a few videos on 60 minutes (which you could check out for yourself online) and I now think that people can also be born gay. These things could be hints to the fact that he is gay. Although some people will never admit it.

I'd check his computer for gay porn sites. Honestly there's probably not much more you can do because just words online makes it hard to know. Then again even living with a gay person that hasn't come out can still be difficult to know for sure. You could ask a gay person you know what they think, or maybe a friend that sees him a lot.