Tang,
I wanted to tell you that I'm deeply sorry that I didn't help you out the other day. That was unforgivable.
There's probably nothing that I can say or do that can ever right the wrong, but I just wanted to at least reach out and tell you that I know I should have acted differently.
I hope that things are better now, and that you have figured things out. Let me know if you need anything. Even though I failed miserably the last time, I'll try to somehow make up for it.