New to the 180. Help?

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He facetimes everyday at 7pm sharp to talk to our son. Sometimes he'll tell me about what he's got going on. Every ounce of our finances are tied, sooo we do have to talk about where it's going sometimes. He also called to tell me to get my own cell phone plan. If he's nice, I'll let him talk for a bit and be the first to get off the phone. My DB coach said that was a good way to go about it.

From what I understand of detachment, correct me if I'm wrong, it's not cutting him out of my life completely, it's just focusing on myself, bettering myself, detaching my emotions from his actions and the things he says so I don't have to ride the roller coaster of emotions with everything he says and does. I've done that. I'm focusing on things that make me happy, losing weight, school, going out with friends, etc. The only contact I have with him since he lives 1200 miles away in another state is when he calls at 7 to say goodnight to our son.

I feel like I've gotten so much additional, sometimes conflicting advice on this thread that no matter what I do, I'm never doing anything right.