I won’t be there for her child
You mean “my child”. A child isn’t more yours because it was planned or conceived in a relationship. They’re always 50% yours.
I can’t fathom how anyone who’s already a parent can think this way about a child that they have created, intentionally or otherwise. Yes, women have the choice to abort - you have a choice about where your semen goes, and you know that this is the extent of your choice, so be a bit more bloody responsible.
Take responsibility for your own semen - unfortunately a child has had to be born for you to realise this, which is disgraceful.
When I used to have casual sex, I was looking out for my own sexual and physical health because I knew for a fact that men I didn’t know very well wouldn’t. Even boyfriends prioritised a marginally better sexual experience over my health, consent and fertility.
The fact that it’s not you who ends up with the consequences of an unplanned pregnancy doesn’t mean you can abdicate responsibility and then have a tantrum when it goes awry, especially when your only required commitment is financial.
No, I’ve never trusted a man I barely know with my sexual health or fertility because it’s me who’d have to deal with the consequences.
And again, you didn’t have to ejaculate inside her. After that first time, when you had knowledge of her allergy, you could have sorted something out - but instead you went out of your way to reassure yourself it was safe to have unprotected sex on multiple occasions because you evidently wanted it.
But sure, blame her, get resentful. She behaved terribly (if what you’re saying is 100% true), I agree. It’s not acceptable, but you are 50% responsible for this child.
This is nothing like stealthing, because you’re not the one who has to deal with either an abortion or a pregnancy and then raising a child. Do you have any concept of the effect of both of these things on women?
Your orgasm was more important. Own that and take some accountability.