Yeah, there is no quick fix here. It's going to hurt for some time. This other girl has a tough road ahead considering you aren't even interested in giving her a real shot. But instead of focusing on what she doesn't have that your ex does, just concentrate on having a good time and enjoying each other's company. It'll take some time together for her to open up and as long as you guys aren't escalating too quickly on the intimate front, this can only benefit you and help you in the long run.
Waking up next to a beautiful girl,
Step outside and say hello to my beautiful world.