My b/f' frm 4 yrs had anotha g/f but i only found ot while i ws living wid him frm 1 yr he taks 2 her on fone?

he talks on the fone with her and dis drives me crazy as i reallly love him and this caused me alot of damage to me so i asked my parents to do me a arrange marraige as part of owr culture but nw recently he dont talk to the girl and as i ealy love him but wnt to get bk to him . wt shud i do give him a chance??