need advice

ok so ive been married for 6 years with my husband we have 2 kids together hes been cheating on me for the past 6 years we've been together i love him alot i just dont know what to do anymore he talking to this girl thats part of the family but not blood related he said there nothing going on but i dont think he telling the truth to me he deletes her messages text and messager on facebook and i know that he calls her and video chats with her when im not around but when i confronted him about it he denies it but he tells me that he loves me i made him choose between me and her and he said that he choose me but yet hes still talks to her more than he dose with me he also told me that its a 50/50 with having feeling for her what should i do??