Ceres, don' go down the road of not using protection, I am in little doubt you will live to regret it. As a female colleague pointed out to me
condoms nowadays are made so thin as to make little difference and I would like to point out this particular colleauge is female and gay. If your'e bf really loves you he will respect your feelings and concerns and seek professional counselling rather than put you in a more risky and worrying situation. I am not just referring to AIDS or other STD's here but if I understand you do not want to get pregnant.
If your'e bf is unwilling to talk or seek professional advice, well I am sorry but he is not worth botherng about, remember love means compromise and understanding. Put simply love sometimes means you have to talk to each other about what hurts most, if you can not then you are in a relationship you had best adbandon. Sorry to be so harsh but sometimes you have to make sacrifices.
My best wishes and concerns and hope you will think - take your time, a hurried decison will be your greatest enemy!