What should I do? I called an ex I haven't talked to in a while for advice and he dropped a lot of emotional baggage on me.
Why did you decide to call him so late at night?
Because I woke up at 3AM and wasn't able to fall asleep again, so I started surfing Facebook and I found his profile there
Even though you are no longer romantically involved with your ex, it would be a good idea to be supportive of him when he is discussing his problems. After all, it was you who initiated contact with him. While it's good that you wanted to get advice, you should also be supportive of him in return to maintain a good give and take balance in your discussion with him.
Nah, he is just being overly sensitive. This is my favorite reaction.
It's good to reciprocate the consideration that other people show you. Acting with your ego, and ignoring how he feels will only cause him to be unresponsive to your needs next time.