My heart is lost!!

I love him with all my heart i really do but at times i feel like we go neck and neck with one another just because we spend time together or what. But i just know that it couldnt be that because we dont really spend time together. Sometimes i feel that he might be ashamed in me or maybe to be seen with me...I dont know but i go to bed at night with this on my mind. Does he love me>? That's the words i hear but his actions are crazy, if i go through his phone there will be things i didn't want to see! If i go on his myspace, my heart WILL break! I made a space to see what he feels and to that girl, he wasn't feeling me. He says baby i love you but to her he says that he is not with me!!!! Whats more crazy is i know he does his dirt but i love him more and more everyday. I feel whole when I'm with him but i just got find out if his heart is with me!!