New to the 180. Help?

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Ill try to make quick work of the back story. Been married for 7 years, have a two year old, just moved to Arkansas for school and bought a house. Husband is active duty mil and stationed in Maryland until March. The plan was for him to move out here (his hometown) after he got out. The same week we closed on our new house he told me he wanted a divorce.

Its been about a month since he told me he wanted a divorce. He dropped the bomb over the phone. Said he'd been thinking about it for a while but wanted to wait until I got settled before turning my world upside down. (How considerate of him)

Since we are separated because he lives out of state for work at the moment, I'm doing my best to implement 180 techniques from afar. I've lost 30lbs and I'm back down to my skinny-mini wedding size. I post pictures on fb/instagram of all the fun crap I'm doing just so I look busy. I answer his calls sometimes and keep them short. I do have to answer them so he can talk to our two year old. I dont pursue and I booked a trip to Puerto Rico with my best friend in two weeks.

Now, i feel like the 180 is backfiring. I'm struggling with being distant but not cold. Am I supposed to laugh at his jokes and engage him in conversation and just keep it short, or detach, not say much and be aloof? If he's supposed to feel the loss of the divorce before it goes through, I dont know which one would work. Right now I'm distracted and have few words with him and he definitely notices. But he asks me what my problem is. I just act chirpy like I dont know what hes talking about. Am I going about this all wrong? Any tips for DBing from afar?