Does the dumper ever miss the dumpee or regret things? Why would he do this to me?

[OptimismSpeaks]

My boyfriend (now ex) left me without much of a reason. It's been 3 weeks since the break up. Almost everyday I wonder if he misses me, if he thinks about me, if he's ever going to come back, etc. Long story short, we were originally close friends for 5-6 years before dating. During break ups with others and other stressful situations, we cheered each other up, gave each other advice, cried on each other's shoulders, etc. He even wrote my recommendation letter for my college which helped me get a scholarship. Eventually, we slowly began dating which formed into a relationship. We clicked like bread and butter. Never argued, not once. Whenever a situation arose between us (which rarely happened), we would talk it through like mature adults. Our affection was passionate. Nothing quick or puppy. It was quiet and slow, just like love movies. We went places together. I was loyal, faithful, honest, and had full trust in him (and vice-versa). He was worried about his health (food-wise) so I taught him how to eat healthy since I eat healthy and exercise and know a lot about health/fitness. I would cook him healthy tasty meals whenever he visited, which he loved. We would massage each other because he would get back aches sometimes while mine were stomach cramps. TMI but we had a very healthy and spontaneous sex life together so that wasn't an issue. I accepted him despite what he "thought" were his flaws which was thin hair, not being lean, being only 5'6, having a semi-high voice at times, still living with parents (he's in college but financially struggling), and being virgin (when we first got together). But I looked past all of that and still loved him (and still do). He was aware that I loved and accepted him despite his flaws. He was very supportive, especially emotionally. He even rushed me to the hospital once and stayed both nights, monitoring me and feeding me and walking me to the restroom. I worked 20 hours making his birthday gift (it was made all by hand). I sent his sick mother a get well card. My own parents visited me when he was visiting me and they took both of us out to eat, as in they treated him to dinner. He's taken me out to eat as well. I'm just saying, my parents loved him. Also, he made a promise to them and me never to hurt me. He also promised to get through every situation as a strong couple. Even his mother texted me writing that she loves me. Eventually he bought me an engagement ring (which he still has to make monthly payments on) and said that I changed his life for the better because he used to be very depressed. Then asked me to marry him and I said yes. About 5 weeks after the engagement, him and his family apparently were going through a lot of legal-related issues but he didn't go into full detail and broke up with me on the spot (over the phone). I was crying and asked a bunch of questions because I was so confused but he just wouldn't give a clear answer. Then, he said that I'm a great person and to continue doing good in school and to be safe, etc. Then the next day he deletes me off all social media, blocks me, and stops contacting me. Yet he still has our romantic photos of us on his Facebook (he's active on it every other day). I found this out through a friend's Facebook. My question is...what the hell is going on?? I've been through multiple break ups, and this is BY FAR the most confusing one I've ever experienced. We were so compatible. Everything felt right, and like real passion. I don't know why he did this. Or why any guy would. I'm a good person. We're both in our 20's and in college by the way.