So theirs this girl that i have past with but now im talkin to someone else?

and we used to talk and i was crazy about her and she didnt wanna date bc she ha just came out of a relationship and then i started datin another girl and then she decides she likes me and is ready to date but imw with this other girl then we break up and shes datin someone else then they break up and were talkin again then i meet this other girl and it didnt seem like it was goin anywhere with the other one, week later i asked the one i was always crazy about where we stand and our situation she says she has feelings but doesnt wanna ruin anything betwen us then im still talkin to the other girl and now shes talking to her ex again well yesterday we were hanging out and she just kssed me and i kissed her back and now its like that didnt even happen and im talkin to the other girl so wht should i do?????? pleas help