Re: The pattern

Doesn't sound like it harmed anything, and now she knows how you feel - nothing wrong with letting someone know you care about them.  I mainly would warn against taking old feelings into the new relationship....like because of how the other girl treated you this new one has to prove herself to you, etc.  Be particularly careful of overreacting to things if you are still seeing them through the betrayal/actions of the other.

Good luck! =)