IMHO, serious relationships aren't about "giving yourself up" to the other person, it's about becoming more than just two individuals. If you "give yourself up", then in some respects, you surrender what your partner first found attractive about you. I'm not saying you shouldn't care about your partner, but you have to have some time to yourself in a relationship, even in a very serious one! You're still two people. It's constricting if someone wants to literally be the one and only thing in every part of your life, especially if they cut off parts of their own life to spend more time with you (such as moving closer if it means he loses contact with his friends).
And for the record, I'm in a very happy serious LDR. So no, everyone doesn't think that. I can understand your perspective, but having one side of a relationship try to mold every aspect of their life to appease their partner is not what I would want to see. I'd hate to see my partner lose her individuality if she did that. This doesn't make me some cold hearted swine.
Of course, I'm sure there are people who want that in a relationship, but if you aren't then nothing can change that. The OP's ex seems to want someone with this characteristic to share their life with, but sadly the OP isn't that person. To the OP, be there for your ex, but be kind but firm that you aren't going to get back together and explain why. Beyond that, there's nothing else you can do. Does your ex have a group of friends to turn to?