when you are better off alone

better off alone:
means it would be better if you were left alone. (我一个人独处会比较好一点). For example, now that I've left my girlfriend, I'm better off alone (和女朋友分手了，我觉得一个人会比较好一点).

I am better off alone:
means I will be happier now that I am by myself.

When you are better off alone:
你觉得什么时候你自己一个人（独处）会比较好一点 （更高兴一点）？

当你一个人时会感到更好