If you can manage to let go of your connection to him, you will be better off. This connection has kept you from moving on. You've been way too emotionally invested in him. Had you gotten into another relationship that you were secure in, then being neglected by him wouldn't have seemed like such a let-down. But it sounds like he has remained your significant other, even though you two are not emotionally involved. That really is not healthy.

For a couple who've stopped dating to remain friends, they really have to totally have lost romantic interest in each other. Usually, from what I've seen, at least one party still has romantic feelings. For that person, the "friendship" is really more.

It hurts to be ignored by someone you've been in a relationship with. He was not a great boyfriend to you. The friendship isn't going any better. Try to let go. It will greatly increase your chances of getting into another relationship that works.