distance..

I know it has been a few months since I last posted after my big Asia trip. These past few months have been excruciating for me. Me and my boyfriend have been on edge of breaking up and I don't know how to save this relationship when he no longer puts in effort. I have been in a depression mode for the past weeks and it seems to be getting worse. I tried to break it off with him a couple of times but he is so persistent on making it work, so I stayed. Now I am stuck in this dilemma and I have never felt more lonely. It sucks being lonely when you're in a relationship and it's nothing like the lonely like when you're actually single. Why is he doing this to us? This is pure torture to my heart. I'd have to admit that in the beginning I was like whatever with him but eventually I fell for him. Not only did I fall but I fell hard. I let him. I caved in to my heart and emotions and this is where it's gotten me. I don't exactly know when we had a fall out but things kept going downhill for us. He started to go out more from stress I assume and became more and more distant with me. When I asked he'd said everything is normal but I can feel the distance smacking me in the face. I tried with all my efforts to hold us together but he kept making our gap bigger and bigger. We'd go from talking everyday and sometimes video calling or calling to ZERO contact. He doesn't explain why or even makes the effort to communicate with me when he can. I know this is an unhealthy relationship and I am trying to let it go slowly but I don't know why a part of me keeps wanting to stay. Am I going crazy? Maybe I am. It's been so long since I've been in a relationship before this one and I feel like it's dejavu all over again. All of the pain and sorrow is coming at me at once. How will I escape this hell? What happened? We were in love and things were fine. Is it the fact that we are half a world apart from each other physically or is it the fact that we're half a world apart from each other emotionally? How do I do this? :(