I know 3 months isn't long enough to fully trust someone even if it's your partner, or know whether you two will be together till the end. But it's just funny how a person can easily change because of money. Out of nowhere, you want to leave the person just because u won a huge amount of money in your name. Legally, she has the right to the prize since it's her name but if the guy is saying the truth that would definitely be unfair, and the girl is pure selfish.
I would understand if she's alone when she bought the ticket and the guy has no engagement during the buying of the ticket. But since they were together when they bought it, it's unfair especially that since you got the jackpot prize, you'll leave the other person alone... If both parties will continue being greedy and selfish, it could lead to a more problem. Their names and picture are being publicized so it can endanger them. Also, it could bring grudge to each other especially it involves huge money, you wouldn't expect what a person can do for money.