Depending on your age here an answer
im 21 and married but being in a long relationship is very similar the rule to common law/marriage is everything is in the open, no lies and you have someone to support you. I kept asking hubby for kids his words were is it happens it happens, I have a 15 mths old girl and im 30 weeks prego but hubby was aware of everything that went on.
A marriage/relationship is based on trust, friendship and sex I think without any of these a relationship would fall apart!!
I would honestly tell bf that you stopped taking the pill and you want to get prego and see what he says, yeah he may be abit angry but you kind of betrayed his trust but it might also open his eyes and he decide to want kids. The choice is yours but honestly he may leave if your not honest with him or he may feel different emotions every man is different, if your man was cheating on you wouldnt you be upset??? Place yourself in his shoes before making a decsion im not giving you hell I just want you to know that this has a double outcome good or bad.
If you got pregnant he would probaly support you but how do you think he will react once he realizes you didnt take your pill???