Girls who should i choose?

I'm datin a girl named Ariana but i like a girl named kaitlyn alot more but i still like Ariana and i could date kaitlyn but i'm scared she will break u wit me in like 2 days. like she has done before so i don't want to kill my chances wit Ariana because we really love each other but i can't stop thinkin about kaitlyn who should i choose????????????