I don't want to waste my time

Either he doesn't know that you're interested because you don't emotionally invest yourself, or he is only interested in sleeping with you. If you like him, you should be up-front and ask about the potential of a committed relationship. Then, you'll know where you stand.

So you have been seeing this guy for four months now. You are not a "dating" person, he is to second guy you have slept with, so I'm guessing you want to only date him monagamously. You want to know quick how he feels so you don't waste your time.

Save yourself some aggravation of not knowing by asking him straight up. Tell him you want a man who wants to see you and not other girls. Tell him you like a man who is an intiator. See how he reacts and what he says. Then see if his actions match his words.

If he really wants to talk to you the way you want he will agree to see only you and listen to how you feel about him initating things. If not, he will tell you no, or if he just wants to tell you what you want to hear you'll have to test him and see if he still tries to date other girls after he said he would date only you ( and you said and did the same). Or if he continues not to initiate (this may be just a habit though, not necessarily that he doesn't care) you'll have to use your judgment on what to do if you want to stay with him as he is or not.

It has been four months, he knows how he feels about you. It is very appropriate (and necessary to save you aggravation) to ask him about this. If he tells you he is not sure, move on. Do you really want a man who after four months isn't sure he wants you monagamously when that is what you want? He has to know what he wants.