Here are a few questions you could ask her.
Before that, you are encouraged to date, but not exclusively. This means first being clear that you want to go on a dating. Spending a lifetime single is not something most people would choose to do, but fear of being forever single should never be a deciding factor in entering a marriage, lest serious problems go unaddressed before serious johns are made.
He is absolutely, hands-down my favorite human being on the planet.