doesn't mean they're fit for that at a young age.
And it doesn't mean they aren't.
It's worth mentioning that in countries with a tradition of extended families, people often have kids later for the same reasons that the extended family is so important. Lack of support from the wider community like 500+, free access to education and free medical care.
And you mentioned Pakistan, where fathers are expected to play a big role in raising their kids.
You're going off topic though, as is Maf, Ironside, etc. There isn't anything to suggest that the OP is bringing up his child in an extended family. The important thing is his question; he's obviously under a great deal of stress.
It does look like the relationship has drawn to a close.
My guess is she already has someone
If that is the case, the OP should certainly end the relationship. Unless he's prepared to have an open marriage which of course maybe something that would appeal. His partner can't take the child out of the U.K. without his consent if they arrange custody correctly so there's no danger of her returning to Poland with the kid.