Guy's Behavior

What should I do? How to deal with this?

I am dating a guy for 6 months. But I don’t know if that it’s even relationship. The 3 months everything was fine. But Suddenly he started to distance himself from me. I was thinking that he is under a lot of pressure. Because he had to write a bachelor's degree and study for the state final exams. And on top of that, he had a lot of new projects to work on. I understand that he is busy, so I give him space. But now I am feeling somehow hurt. Because I have feeling that he lost interest. I am the one who try the most. I know that I said that I gave him space…But when more than 10days he didn’t respond to my text. So I have to reach out to him again to see if he was okay. And if I'm lucky, we're in contact, he is with me in contact for a while, and then he suddenly disappears. And it keeps going round and round, and always he said to me that he is really busy, that he even don’t have time for a sleep. Everyone told me that being busy it’s just an exuse, he probably has another girl and lost interest. I want to get a closure. And even if I want to break up with him…I want to do it personally, like adults. But even that is impossible with him, when he dissapear and sometimes reappears. The worst part is, that I hate myself for still have feelings for him. So what should I do? How can I move on, without closure? And why guys behave like this? Playing with other emotions? If he lost interest or find another girl, he could just tell me. Or just break up with me, and not disappear and reappear?
What should I do? How to deal with this?
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