I agree with Iseulda.
My boyfriend and I only use the pill and no other form of contraception. (We plan on getting married in the next couple of years so we feel no need for anything more). I believe consistency is the key to the pill being completely effective. I have an alarm on my phone, so I'm able to take my pill at pretty much exactly the same time every day. I've been using it for about 8 months now and it's worked out very well for me.
Look, if the pill has been working so far for you, as far as regularity with periods and everything else goes, you should be right. Just follow the instructions to the dot. Condoms are also a good option. The withdrawl method is probably the least effective of them all in terms of contraceptive in the first place.
As far as your boyfriend's stubborness goes and your worries.. Well, it is a fact that it is far more pleasant for a man to ejaculate inside the vagina than outside of it.
However, if he is putting pressure on you in a nasty way or making you feel uncomfortable, unhappy or stressed out - that's certainly not a good thing. Have a nice long chat. If you're still concerned or uncomfortable having sex without using the withdrawal method and he absolutely refuses to budge.. well, there's really not much you can do about it.
Both of you need to make sure you've got each other's best interests at heart. If not, well, it's your decision on whether he's worth the trouble. Lol, sorry to be so blunt.
Good luck.