Give Him/Her Time

You might be REALLY sure this is a great relationship. Your past experience, and knowledge, and feelings now help you understand how special what you have is. However, your partner has quite different background, and experience, and feelings. Let him/her reach this decision without pressure or rushing. If you rush into a decision, it will always be second-guessed later on, any time you hit a rough spot. If you go into this slowly and with both of you in full agreement, it will help make the whole relationship solid.