Need help understanding the guy I'm dating?

I've been seeing this guy for 10 months now. When we met, we were both fresh out of relationships (I had been single for 3 months and he had been single for 2), so neither of us were looking for anything serious. Despite this, however, we ended up falling in love and have been dating exclusively for the last 7 months. Now, in the 10 months we have been together, we have split up 6 times... 2 of those times I ended things, 4 of the times he ended things. All of those times were in the beginning, when we were both scared of our feelings. We call them our "customary 3 day fights" and when we begin an argument now, we usually end up with one of us saying "I don't want this to turn into a 3 day split" and we take the night to cool down before we talk. Now, the thing is, I give this man everything. I can't love someone a little, when I love, I love completely. He, however, keeps a part of him closed off to me because he was so hurt by the 12 years he spent with his now ex-wife, so he refuses to give himself completely to another woman. In the meantime, I end up getting hurt. He's gotten drunk and admitted to me that he has texted her, but that was months ago. We've been going great since January, when he finally let her go, but he still doesn't want the title of relationship. I know he's not seeing anyone else, we spend every single day together. Our kids are friends, and when my kids and I aren't sleeping over at his house, he and his kids are sleeping over at mine. We spend maybe one night a week apart. Anyone who knows us, all of our friends, they all say that we're together, but he refuses. He says titles make him feel trapped. I give him everything that he asks for, and things he doesn't ask for. I bought him a $500 phone for his birthday, I babysit his kids in the morning, I do his dishes and clean his house, I cook for him, I buy us beer and I buy him cigarettes when he's low (now, keep in mind, other than the cleaning and the dishes, he does all of these things for me, as well). We have a blast together, we feed off of each other like the main characters in Dean Koontz novels. The only thing I've ever asked him for, the ONE THING, is the title. I don't care about him buying me things, or any of that... I just want the title... and I don't know how to approach him without him shutting down. He's started finally opening up to me, he's actually opened his heart to me in the last couple of months and has begun to tell my kids that he loves them, and treats them like they are his own children. He has a big heart and is the most incredible man that I have ever met. I've tried to give him time to realize on his own that we might as well have the title, but he can't. When he meets new girls in bars and what not, he usually brings them over to me and introduces me as the girl he's seeing, or calls me his "psuedo-girlfriend" so they know he's taken. He gets jealous when guys hit on me (not talk to me, I have plenty of guy friends... more like when they ignore the fact that I say I'm with him and they try to get me to go on dates and crap. It's happened more than once), he tells me he loves me, tells me I'm his best friend and he can't go a day without me in his life, but the title eludes us. How can I make him see the title is just a word and shouldn't make him feel trapped, but that word means a lot to me? I'm tired of being introduced as the psuedo-girlfriend or the friend he's seeing. It's been 10 months! He used to be a self proclaimed runner, which is why we've broken up 6 times (sorry, psuedo-broken up lol), but he's gotten past that. Anyone have any advice?