the past 4 weeks of my life

Hello my name is toby and im 15.......and my life sucks......now sit down next to the fire....and roast your ham.....i got a story.......my firend of 2 years has been ignoring his gf (we will call her ash) for a whole month lieing to her (none of us live in the same state) and she breaks up with him....now i hated this chick but then i got to truly know her....now im a very and i mean VERY sexual person so i flrit with her...she flirts back and at some put we swap nudes now shes 1.3 years younger then me but wgaf....and some things happen he tells her to kill herself (she is very unstable...she cuts allmost every day) and thats the last straw i go off and yell at him....i stop talking to him for the day...and 6 days later he starts dateing her firend....they break up 2 days later (he ignored her) now at this point i drop gaming to spend my time with ash (still not dating) And she gives me a little show.....a day later theres another fight with ashes firend when he tells her the kill herself....at this point i stop talking to him......a day later ash invites her firend into our realationship (still not dating) we have fun they eat each other out and i watch....should i have left my firend for them (i feel bad for leaving him) ? If you need any more info please ask in the comments