You already know the answer to this. It is right in your question, but I'll spell it out so there isn't any doubt about it.
If you want to know, ASK!
You cannot make yourself crazy wondering about everything and interpreting his actions. Just ask him!
If you want to be exclusive, say so! If you want to know if he's seeing other women, ask him! It is as simple as that.
If it boils down to the fact that he likes things as they are while you want more, then the relationship is not for you. YOU are the only one who can decide and YOU are the only one who can make your feelings known.
But then, you already knew that, didn't you?