Need help guys.

So, I'm 31M , I had recently started seeing someone and it went on really great for few months and we even met few times. Since we were from different cities, we hadnt met much.. Everything was going well but one fine day the girl said that she doesnt feel anything for me and she doesnt want to continue. It was a bit tough for me to move on from here because I was really attached to her and in love with her. But somehow i moved on or at least i think ive moved on. I recently started talking with someone else. Its just been few days and i like talking to her.. She's a very sweet person.. Everything is fine but i keep getting these thoughts in the back of my mind about the prev person. Like , if I'm talking with this new person about something i get thoughts of talking the same things with the prev person with whom i had connected earlier and that leaves me sad that things didnt work out with her. As much as i really like talking with the new girl, I'm not able to suppress the thoughts which I'm getting about the previous girl. I really don't know how to tackle or overcome this situation. If anyone has any suggestions would be really helpful.