I'm terribly sorry you have been so hurt by all the lies this girl has told about you. I still have to believe that he loves you and know down deep that these things are not true. However, he is being blinded by "love". There is really little that you can do but be supportive when you can and let him know you still love him. Hopefully, your bf helps out with this. Best wishes to you. Hope things get better. I say go to his events even if you have to see the gf, let him know you care.