What would you do in this situation?

I have this situation on my hands that i really detest. It started out with this girl i know, breaking it off with her boyfriend. We ended up becoming really close and i asked her out. She told me at this time that she cant have a relationship now, and i told her thats fine i could wait if thats what she wanted. It wasn't long after that i noticed her talking to other guys, and even though i understood that we weren't dating, it still made me jealous. I asked her later on if she liked another person or if she was out just for flings and she told me that she was wanting a fling. Whether or not it was justified, i felt kinda rejected and lied to. After a few days of depression, by some coincidence i end up talking to this other girl. I end up asking her out because i get close to her. Now, the other girl is talking to me and i cant help but still have feelings for her but i also like the other girl im currently dating. I feel really split and leaning to the first girls side because i have known her longer and have gotten closer to her. Going back to the first girl could likely end in depression and hurt this other girl. I dont intend to try for two because my morals and belief in whats right and wrong wouldn't allow that. This is more so just teenager drama i would presume, but i am curious on anyones thoughts or ideas on the matter