If you're trying to find some logical explanation about this, you're probably wasting your time. 

So, he loves you, but doesn't want to be with you, and feels he's a failure, and led you on, and wants the best for you, and has an emotional disorder.....which leaves you wondering if you found your way into some alternate universe. It's common and it doesn't make any sense. 

Meanwhile, you have a life, don't really need to carry any guilt for something you're not responsible for and there's nothing you can do at this time, except climb out of the pit and start making positive changes in your life. I know this sounds like fluff; especially with the pain, anger, sadness, guilt, confusion, and dismay you feel at this time. 

Take care of you first; the rest will fall into place.