my ex-girlfriend asked me out again

i dont know why she insist, i mean in the past things never worked out. everytime we were together it was just to fool around. which was fun by the way, but it jusst doesnt seem right... sometimes i do feel atracted to her. and we start foolin aaround. and theres this girl alma i barley met her and i ffound out that shes bi, and i dont know if shes trying to make a move on me, or jst being very friendly...