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Demand respect. Give him a little bit of the cold shoulder. If you feel like he's cheating on you, end it.
If he thinks he can get away with ignoring you after your attempts to turn things around, and you let him, then he is getting away with ignoring you. If you demand respect from him, telling him what you will and won't stand for, he won't have any other option.  Tell him how you feel. Tell him you need better communication, and that you'll try to communicate better too. Tell him if the communication doesn't get better, you might have to consider calling it quits. If he loves you and respects you, he'll change in an instant. If he doesn't love you and doesn't respect you, why would you want to be with him? Go hang out with your friends and guy friends. Make sure he understands that you have a life, too and that he's lucky you're including him in it.  Most guys will immediately come running back and stop ignoring you, especially if you're hanging out with other guys. They'll get territorial. It's just how guys work. If he doesn't come back to you and keeps ignoring you, ask yourself if you want the relationship you're getting. One hundred percent effort from someone else is probably better than 50 percent effort from him. Of course, it helps to have proof: You don't want to break up with him just because you have a "feeling." But if stuff doesn't feel right, have a talk and figure out what's wrong. If nothing is wrong, and that's just how things are, then you probably want to start looking for a new boyfriend, because things just aren't working for you two.