What would you do if you love someone but he is already married and one girl run to her?

this girl also text me that i should stop texting this guy. i dare to her if you can arrange face to face tell to this guy he must choose but he cannot bec. he say he love both of us..but when i talk to this guy alone he told me he loves me and just wait and this girl told me she is the first gf of him that from the start i knew that they are together before us....look im not crazy but this guy told me he loves me more than to her..actually we always fight and i have more bad words that i say against to him its seems like he is not affected still he say he loves me so much but how can i believe him if this girl he always allowed coming in his home.....he just laugh and sometimes he also accusing me i have another guy.. my gosh! i say to him why i keep calling on you...he already married and i accept that bec. he is muslim...but except that girl i cannot accept that but i dont know what his plan why he keeps me while he still have relationship with that filipina girl like me..confused?