See not always only pleasant things happen, unpleasant things do happen in life. It's a part of the whole thing. Isn't it? What you can do here - you can reduce all the unpleasant things as much as possible. How? By spreading love, by spreading knowledge by educating.
Who knows when good friends might become jealous and when jealous friends might become good friends. That’s why it is said that ‘kaalaya tasmai namah’ (Bow down to the grand time).