So what is your thoughts on this, 50/50 good for you or nah?
No evidence that the man is telling the truth. No evidence also that the woman is telling the truth. But that woman has the legal right to the money won.
What form of legal right does she have to the money? They are still dating and are not legally married yet; at least that's what the news states, unless there are some legal policies that state a girl is entitled to the person she is dating.
But looking at it from the aspect that they went into the lottery shop together and the bank used to pay for the lottery card belongs to the lady, then she deceived a fair share of the money, even if it's up to 50% of the amount won. It wouldn't be a bad idea if there was no condition attached to the money when she paid for the card.