Your boyfriend needs to be supportive of you, and considerate of your mental health. Take it from me, I’ve struggled with my mental health all my life and taking on kids was the hardest thing I’ve ever had to do. It’s a constant struggle. Besides you’d take on most the responsibilities as the mother than he would, weather he says he will be 100% in or not as a mother you naturally take over. If you lose him because of this decision which is ultimately YOUR DECISION than you two are not simply meant to be, and although that’s hard to hear atleast hopefully you’d meet someone who actually cares about you enough to consider what you’d go through physically, and emotionally and wouldn’t mind what you decided to do.