this guy seems smart and like a walking time bomb.

do NOT let him know what you are thinking or pursuing.

set the stage to remove him from the home.
(a RO would be what you need)

keep all of your plans 100% to yourself.
make sure you clear the cache and history of your computer,
and any phone evidence of your leaving.

you might want to keep an mp3 or other recording devise on you in case he starts to abuse your or your daugter.
at least then you have evidence.

as it is,
you word and your child's word
SHOULD be enough to get a RO so he gets out of the house.

this guy is alarming!