Do not have a talk with him. If you do, you’re going to make him feel self-conscious and pressured. In addition to which, you’ve only been dating him a month, so slow down, cowboy! 😆
The first thing I’d advise you to do is not to spend five nights a week with him. It’s too much too soon, and you’re making things too easy for him not to chase you. In addition to which, if you’re not in his bed so much, he may want you more. Right now, if he’s not ready to have sex with you because it’s too soon in the relationship for him to have sex or to tell you why he’s not having sex, your being there, literally, in his bed five nights a week is probably making things difficult for him.
So if you want to find out more about how he feels about you, back off and give him something to chase. He’s got to feel like he’s the man in charge in the relationship — not the one being pursued. If you can readjust your behavior to allow for this dynamic, I think you’ll find he’ll be a lot more interested and open with you.