So hard trying to pretend to be friends with her. This is what Chuck (my DB Coach) said I should do - act friendly and treat her like a sister. Very difficult to maintain without telling her my feelings.
This is where you need to work within yourself.
If you can't be friendly without it tearing you up. Don't do it. It will backfire.
Who am I to disagree with a DB coach, but rather than a sister I would think of it as a co-worker.
When you communicate be kind and polite. But I would not call right now "just to chat."
BITS
Happiness is not something ready made. It comes from your own actions.