I don't visit Casinos, but if I did I don't think I would shove 50-65% of everything I owned across the table on a bet with a 50% chance of losing.

If you have a good relationship don't complicate things with marriage unless you want children or feel you must observe some requirement of religion. If either party feels that the promise of another is not trustworthy, a paper contract will not make it so.

Marriage can be great or a living hell. Find someone who is mature and compatible and spend a great deal of time with them before making what should be a lifelong choice. With the right person you will both be rewarded for your efforts, with the wrong choice the pain can be extensive.