This is disgusting. I assume you’re
not using condoms? This is often how so many women fall pregnant while using contraceptive and seem all confused - they’re not doubling up.
This man is making all these grand proclamations of love super early, and having unprotected sex so it’s likely this is his MO with every woman he meet. I’d definitely be getting myself tested asap.
Aside from the STD risks, he is lovebombing you and being massively selfish and irresponsible. It’s easy enough for men to get a woman pregnant but you’re the one left carrying the baby in more ways than one.
Why on earth do some men just assume women are desperate to carry any man’s baby without even attempting to prove to the woman they are are going to be a great father and partner? Sadly the answer is probably because some women with low self esteem do fall for it and feel flattered.