What shall i do? continue my affair or dump him?

i am a 16 years old girl who is frm a gud family and well educated. i found a guy to love who is 22 yrs old and who is poor and uneducated. i loved him frm da depths of my heart and never felt dat he unsuits me. he also praised me alot and said dat he loves me and wil never leave me or betray me. now it has been 1 and a half years 4 our affair. frm da earlier days he had a tatoo of his ex gf's name on his hand. whenever i see it my heart started burning. but i controlled myself bcs i love him more than myself. time to time i got to know dat this grl is comin to his house and they r stil in da affair. bt i always trusted my bf and did not listen to others. even his parents like the other grl. and she is nt even pretty. i also had with him but i did not loose my virginity. he always praised me by teling dat i trust him alot even when a tatoo is on his hand. but yesterday i got to knw dat the same things he tells me, he also tell da other grl as well. he had with her as well. their affair is stil gng on. he is double playing. so i talked to him and asked then he said dat it is true dat he betrayed me and lied to me. but he says dat he loves me and not the other grl. 4 so much i have been loving him and i have been in so many risks and family problems and i also lost my friends bcs of hime. what can i do? i have decided 2 talk to him 2maro and finish this off. somebody pls understand my situation and help me.