Pre- maritial relationship discontinued

Hello Experts,

One of my friend Mr X, was in relationship with Ms Y from last 5-6 years. Mr X is Jain & Ms Y is Punjabi by religion & Caste, still both families agreed for their marriage and performed pre maritial rituals, in front of close family members, known as "Roka" in Indian context. The same was done around 1.5 years back.

Now from last 1 year the couple is facing some personal conflicts and Ms Y is in Australia from January, 2015. Both Mr X and Ms Y are now unwilling to marry each other. They have confirmed the same to their family members and to each other on Call & through "Watss App" a chat application.

Family of Mr X, and he himself, is willing to get in writting that, this relation is discontinued with mutual consent and under no due-undue influence. They want the same, so that, in future any of the above, namely Mr X, Ms Y and familiy members of both, cannot claim any right or liability of what so ever, against each other. Family of Ms Y is opposing to giving anything in writting.

Please suggest asap.