They will allow their jealousy and envy to get to such a point that they can hardly stand to see you succeed. In fact, they can become more interested in bringing you down, than working to pull themselves up.
Of course not!
You forget it moments later.
Do the same with people who are trying to bring you down. Just step over them and continue your journey without giving them another thought, other than to be aware of their low character and to be on guard against their tactics.
My philosophy is:
It's none of my business what people way of me and think of me. I am what I am, and I do what I do. I expect nothing and accept everything. And it makes life so much easier.