You don't seem to understand thatIt's more like saying, "i'm not going to be involved in this". And that's about the extent of your power.
Unless you want to do something really fvcked up, like manipulate her into an abortion, ala Tom Leykis' "hail mary".
I'm not into that.
And you would deal with it, how?
1. Just basic human decency OP should follow up with her. This isn't someone random woman he slept with, this was his gf.
2. To cover his butt he needs to follow up with her. Just because she SAID she's going to get an abortion doesn't mean she will. People change their mind's all the time.