You are not abandoning him if you leave…
But you would definitely be abandoning your daughter if you don’t.
I am sorry I know this can’t be easy, but you really need to get out, and if you can remove it all, your feelings, his feelings, and just look at your child, let her guide you…she is not telling you she wants to leave without a good reason…Do not let her live in fear.
I rarely tell anyone to run, unless there abuse present, but when it comes to meth, which has haunted me for decades…you got to, you just have to leave, there is no way around it. You can‘t even work on yourself enough to be able to stay and be healthy, it is too dangerous. The level of unpredictability is too high, the level of deviant and violent behavior is up there too, and the worst it doesn’t matter if they are high, coming down, haven’t used it weeks...
Take care of you and that child of yours, you are both worth it!