What are the chances it will work out?

I met a boy in a chat room I went in out of pure boredom almost two years ago and we really hit things off. We kept talking for almost a year and then we lost touch for 8 months. Long story there though. We got back in touch almost five months ago and I’ve never had stronger feelings for him. We’re in a relationship and that’s very clear now. He means absolutely everything to me. We know so much about each other, we talk about anything and everything and if we ever fight or disagree, we make up almost immediately. He lives 1,000 miles away from me though. We’ve promised each other that we would wait 3 or 4 years for one-another. I have doubts though. I have so many doubts. I feel like he could do better than me. I feel like he deserves better. I’ve told him so. He hates when I think like that though. He tells me that I’m the only one he ever wants. He says I mean everything to him. He loves me. I know he does. He’s even promised he’ll stay a virgin for me until we meet. How many guys wait 3-4 years for a girl? AND stay a virgin that long? Why do I have so many doubts? What are the chances it will work out? He’s the only one I want. He’s the only one I’ll ever want. I’m absolutely terrified of losing him. I don’t want to lose him. 30% of long distance relationships last. Do you think there’s a chance him and I might be a part of that 30%? And do you think he will wait? Do you think it’s possible we’ll be together in 3-4 years? Do you think he’ll stay a virgin and faithful to me? He’s everything to me. Why do I have so many doubts?