My boyfriend is serious about me and i'm not ready for it!!i want to breakup without hurting him! help me!

my boyfriend very damn srs bout me, whn eva i ask him bout dis hes like....gets senti n i feel pity n just cant say wt i feel like......i feel hes going around with other girl too!! dats wht othrs say to me bout him...i don't trust them....but dis time even i saw him wid dat grl.....but dat grl is a very good friend of mine i dunt believe she'll do dis ...i go through a very frustrated day...just b'cuz thinking bout it....he wants me to be with him....but i just don't feel like ...and I'm being very rude to him...feels like.....leaveing evrithing...i cry evriday...i'm very very confused.....and...my final dicission is to break-up...but i feel he srs....and.....will be hurt very bad wala.....and..i dont wnt to do dat as hes a sweeeet guy......wnt to see him happy....but wnt to gt ovber oll dis buissness.....plzzzzzzzz help me....!! for more detals....contact me...thorugh ansrs...i owe u guys! thnx! mwah tc luv u peace!