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When someone you love is going through a difficult time, it's important to check your emotions at the door in order to help them. It doesn't matter how what's happening makes you feel. You're not the one dealing with this situation. What matters, is that the person you care about is in trouble. Focus on them, their problem, and how you can help them out.. even if it means leaving them alone to sort things out.
When you want to support someone, you should do it wholeheartedly.. or not at all.