Blow jobs ......mehhhh

Ok so I've been dating this guy for the past year an a half and he has brought to my attention that if I don't give him a blow job then we're not having sex, then he has the nerve to tell me that i don't care about him if I won't do it . I've told him before that I'm not comfortable doing it and it makes me feel nasty.. I don't know what else to do .. we haven't had sex in the last four months..heeeelllllppppp!!!!!