I need your help?

my boyfriend went through a nasty devorce.and she got sol custody. she has been with 3 men since april.since the devorce. during the divorce she had told the courts that she was marrying one guy so she would look stable. as soon as the devorce was finnished she broke it off and married a guy from out of state she barely new.besides that she has a nother man whom which is her suger daddy. She refuses to let us know who is living with her evan though by court order she has to. we heard through the gvine that she wants to move out of state and she is trying to find a way to move. the court order states that she cannot move for any reasons out of state.she is starting to not let dave see him and trying to make the emails look like it is his fault he cant see him. she threatens him about seeing his son which is the court order also that they cannot threaton the other parent about seeing calvin. She has pulled him out of preschool which is part of the child support .what can we do?