C.D.
The boy is just out of babyhood and he is expected to spend split his time and living arrangements between the people who are supposed to love him more than anyone/thing in the world. On top of that he is supposed to welcome his daddy's new girlfriend with open arms. Put yourself in his shoes- he does not think or act like an adult and he should not be expected to! Children at this (or any) age desire more than anything else in the world- consistency & love. Please be sympathetic to what he is gong through. Yes, the whining and crying are irritating- but you are not his parent and he should not have to answer to you yet. Personally, I don't think you should move in with the boyfriend unless you are married to him- this would just add to the inconsistency that this kid is already experiencing.