I want to get over someone who meant so much to me yet I meant so little to them
Why do you want to get over them so badly.
All the time I spend with him was useless.
If a relationship is not even then it is most likely not a good relationship to be in. If you feel you love your partner that much and your partner doesnt show love for you, then you deserve someone who can love you the way you need to be loved.
Am I being selfish?
You are not being selfish. You deserve to be with someone who loves you as much as you love them. While it may be difficult to get over, just trust that you will eventually be ok.