The whole situation is something unusual because maybe your husband is just a caring individual who thinks he can fix everyone. The little sisters background sounds a little too similar to yours and that's what triggers uncertainty to me. Seems like your husband likes to save the damsels in distress. You've got your head on right so now he's growing closer to the next person who needs him. He may be the type of man that needs to be needed. I don't know but I don't like the situation and I think it needs to stop!