Damon is just selfish. He only cares how he feels, oh yes he will feel awful cuz Elena will die. But he does not consider her feelings. How she will feel when everyone she cares about die??? Does he really thinks she will be happy and gratefull to him? He is ready to save her at the cost of other ppls lives,ppl he does not care much, just so his feelings would not be hurt. I don't think anyone of you will be happy to stay alive when all people you loved are dead.
Right now I can't see Elena being with Damon, unless something really messed-up happends to her head. So it will be interesting how writers will play around it.