I think in friendship, you want to be there for your friend, and sometimes you just don't know what to do or the relationship you have with them is not clear enough for you to know what to do.

Show me a genuine case of platonic friendship, and I shall show you two old or homely faces.

Friendship is also about liking a person for their failings, their weakness. It's also about mutual help, not about exploitation.

Pity and friendship are two passions incompatible with each other.

I think the way to keep a friendship is to respect that everybody is different.