My ex GF wanted some time, I gave it to her, now she wants to come back, I am fucking other girl.

I was in LTR, things started to get complex because of my work and some family issues my ex GF had, she had to go to another city to help a family member with some health issues, before going there she told she wanted some "time", I wasn't going to argue with her, I agreed. She was not being mean or anything, she just said she had too much in her life and couldn't handle the pressure of a relationship at this moment of her life. Went no contact on her, and started approaching other girls, the next weekend, she initiated conversation that weekend very friendly, and I was replying I actually missed her, but I was not going to give in. She was going to be away from the city for at least 2 months. The next weekend, my brother invited me to a party and met this young girl that from the moment we met started hitting on me, we ended up going out, and we fucked on the 2nd date. So I am still chatting with my ex GF she really seems to be making the effort to fix things, probably because she realizes that I wasn't chasing after her, she is even making plans for us moving together (It's not going to happen, at least not soon), definitely prefer my ex over this other girl. EX is 8.5/10 this new girl might be a 6.5/10, she is still very young an inexperienced (I actually like this) and I am only the second guy she has slept with. So I might explore the idea of getting back with my ex, when she comes back to the city, and I want to ditch the other plate to prevent potential issues with my ex finding out, but I also want to do it smoothly, I don't really want to hurt the other girl.