Blow Jobs..

So my SO & I have been together for almost 5 years now & we have a beautiful 1 yr old son together. 
Our sex life has been great up until now.. I've NEVER in my life given a blow job. & I don't plan on it either. It's just something I don't want to do. It just is one of those things that I'd rather not do.. 
These past couple of months my SO has been asking for a blow job multiple times a day. Everytime I of course say no & he gets mad everytime. He says stuff like "we aren't gonna work out" "if you don't change, we won't be together much longer" & today he said "if you don't, I'll be heartbroken".. 
I love him & don't want to lose him, but I still say no.. 
Am I wrong here? I REALLY don't want to do it.. Am I being inconsiderate? Am I a bad girlfriend? Because that's how it makes me feel.. 

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