We all have habitual ways of behaving -- almost coded responses that occur when certain buttons in our psyches are pushed. Thus, each new romantic relationship can end up being a mirror image of the last one, because we behave in the same ways again and again, allowing the same buttons to be pushed and the same coded responses to come out. This relationship is one of generosity and general good will, and that kind of energy should be both enjoyed and used for the learning opportunity that it provides.
You're both willing to move past your old, tired habits of behavior, and you grow in ways you can't even imagine! You have had to work hard to make this happen, however. If you just allow yourselves to operate in the same old ways, you'll find yourself repeating past romantic relationships -- ones that, obviously, didn't work out. So to avoid the same fate with this one, you'll have to go about it in a new, more conscious way. Be aware when your buttons are being pushed -- which you can recognize when you suddenly get irritated with your partner with little provocation. Be sure to communicate clearly together. If your partner brings up an issue with you, don't react defensively -- listen and see what you can learn from it. If you have an issue with your partner, be courageous -- bring it up! You both stand to learn a lot from this relationship, so don't waste the opportunity.