GF wont give blowjob

If she's your girlfriend and she's giving up the pussy, then she should be ready to suck the dick as well. That's considering that she has sucked a dick in the past. If she has never sucked a dick before,then have a talk with her and see if that's something that she will eventually be open to doing. If so, just be patient. If not, let her go if you feel thats something you must have in your relationship