I've had a soft spot for MH because i see a self destructive, troubled soul who tries to see the best in people, but lately she has come across as being selfish. I won't be surprised if she looses the people who genuinely do love and care about her.
Aj has probably seen her at her worst and in some extremely dark places, he's picked up the pieces of a broken girl and put her and her life back together, so part of him is probably torn because if he kicks her out she will spiral and i don't think he's ready to do that because he loves and cares for the lass, however his child should always come first and maybe kicking mh to the kerb will give her the wake up call she needs.