They ARE our choices! You decide whether or not to have sex with him, whether or not to use a condom and whether or not to have an abortion or a baby. He can't force you into an abortion or childbirth. He left, so what, if we wasn't your husband he had no legal obligation to do anything for you, he wasn't responsible for you or your family if you weren't married.
It's called PROCHOICE for a reason, a burden would be if you didn't have the option of abortion or BC. You're the one with the uterus, you're the one with the control. His blaming you was wrong but his leaving- he has no obligation to hold your hand through a decision- in this case, an abortion.