How come everything my guyfriend at work says to me is sexual?

I saw him act that way to another girl after me too. Even if i say 'i have a male roommate' he will say Do you find him attractive or he says we could gettogether. But mostly its him saying sexual stuff to me or like about me and him. For example he said what kinda kisser am i and asked if im a slow kisser.

Etc etc i dont wanna keep going into detail.

He has a girlfriend by the way who he has sex with.
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The point is that he cannot have a normal convo without it going sexual or it has to be about one of his interests. Only then will the convo not become him being sexual.
How come everything my guyfriend at work says to me is sexual?
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