How do i get him to regain interest in me?

he's chased me for months and at first it was just friendly flirting, and initially i rejected him because i wasn't interested and friends kept telling me he liked me and thought i was pretty. I was confused at the time and I even ignored him for 2 weeks and deleted him off facebook, it was immature i know. But after those two weeks of ignoring him,i started to realize how nice he was and we started slowly talking again and flirting all over again. Pretty soon, i ended up falling for him and told one of his friends, and also asked if he's seeing anyone new. It turns out he wasn't, so I assume his friend told him of my renewed interest and something between us sparked. One day while hanging out, he had grabbed me and kissed me, it was an amazing first kiss, and after that he asked me to hang out one night, and we did, we ended up going a little too far, but not that far, and i asked him where this is going really, if into a relationship or not, and he asked if i wanted a serious relationship, i said yes and he agreed to one too. At first it started out nice, he would call and text and i would bring him food and offer to help him, the typical cutesy stuff, and the sex was ok, but after a while he stopped calling and texting and made excuses that he is busy or sleeping, he also didnt seem as happy to see me anymore, i called him twice that week and left one or two texts, so there is no way i was being needy or clingy. but of course any girl will start to get confused when her guy stops calling and would want answers. he said he is trying his best to be with me and that to try to understand him. maybe he is going through a tough time, but the least he could have done is actually tell me he needs his space so that i wouldnt have to keep asking and wondering why he's acting like this. and then one day he was reading my phone and saw a text i sent to my friend asking for advice on what to do, he got mad at me for it and thought i was hiding things. but then we talked it over and things were fine after i explained to him that i simply needed someone to talk to. he then didnt return my phone calls for the weekend and outright ignored me, i tried breaking up with him before but then i finally sent a text saying maybe we should just be friends cause it no longer feels like a real relationship, he even lied sometimes about not recieving texts, and he responds by saying, fine if thats what you want, i was so shocked by how he just didnt care, and then i asked why he stopped caring and he said he didnt know, and that to change things back to how they were before, so that we stop hurting each other. when i saw him again later that day, he ignored me again, and just avoided any questions or avoiding hugging and everything, he did like me before, he told his friends he thought i was sweet and stuff, but he was acting so distant and different. i tried to talk to him and he just laughed every thing off or just walked around, and i ended up crying from frustration, i wish i didnt, but it was really getting to me, his entire attitude changed all of a sudden and he comforted me and promised to call me later that night, and he didnt call, so the next day when i saw him and his friend, his friend tried to get him to finally talk to me to see if we can work things out and what was up, once again he tried to avoid me and walk around, until finally, i was like, ive been waiting for a while, i just need 5 minutes of your time, and we finally talked, and he said he has been going through some personal issues, and that he cant take care of me right now, he also said he lost interest in the last few days and just wanted to stay friends, i was so shocked and hurt that i started to cry and he apologized over and over for hurting me and said he never wanted to hurt me, he said he knew how hard i tried to make it work, and even after i left and he walked me home, he proceeeded to text me saying how sorry he was that he feels bad and that he just wanted to give us space to give us time to think and think about the things that get him confused, i replied back hours later saying he never gave anything a chance to see how good things could have been, and later on he came on chat and messaged me asking if we were still friends, and i told him i would leave him alone, and he asked why, and i was like, im just gonna take a step back, and he asked if we're still friends, and i said yes but that its hard for me, he always ignored me and made me feel like he was mad at me, but then i learned i did nothing wrong to him, i dont understand why he would want to be friends and want his space at the same time, how do i get him to gain interest in me again like from before, why am i so blind and what can i do to fix things and make it right, i saw him again today and we didnt even talk, i wish i knew what to do