You exposed yourself to pregnancy a second time to make your boyfriend feel better? Do you think becoming a father at his age will make him feel better? You don't think he'll be wondering in the back of his head "If we hadn't done it that second time maybe she wouldn't be pregnant right now"? I promise that him wondering if he pressured you into sex won't bother him half as much as knowing he's going to be a father whether he's ready or not because he had careless unprotected sex.
And what about yourself? Are you really willing to risk becoming a mother at 16 years old in an attempt to make your boyfriend feel better? In all likelihood you won't even be with him in a year or two (not trying to be mean of course, but teenaged relationships rarely work out) and yet you're willing to risk the rest of your youth on a pregnancy with this boy. Your child is your child for the rest of your life, and that's a new kind of responsibility that you really don't need right now.
What's done is done, and I just pray you'll take something away from all of this. Condoms and birth control are your friend, and you should never consider sex without one or both. You have your whole life ahead of you. You won't just be protecting yourself from pregnancy, but also STD's and cervical cancer. You're still so young and there's so much in front of you. Don't throw that away. Please take care from now on. If you want to make your boyfriend feel better, sit him down and talk with him, or write him a long letter. Don't repeat risky behavior that puts both your futures in jeopardy.
Be safe and good luck.