"Several months ago" ... Not exactly suggesting it would happen over night. Recognizing a schism and supporting eachother through the changes in life is preferable to doing so depressed and hatefully, no?
You don't have to be miserable, but the misery from leaving someone you love, even if it's 1000% mutual and friendly is not really a choice, but a natural and healthy emotional reaction.
Sure, but it's not the only valid response. It's perfectly natural to be upset when a relationship falls apart, but it's just as natural to mutually decide things aren't working out and move on without grief or regret.