Only time will tell what will happen with you and your gf. You'll just have to check your happiness radar on a regular basis and go with it.
As for mistakes - trust me - I made tons of them, especially in the first 2 years after ex left. But it is from the mistakes that we learn the most. I had to do the work, make some changes, accept some things I didn't like and dig up the courage to move on. I have no regrets.
I guess we can call if LIFE. Not one of us knows where we're headed - we just have to go with the flow.
