I care bout my ex gf but has she fully moved on?

i want to get my ex girlfriend back. i called her said i missed her she felt same & then her close friend died. didnt speak to her much for 2weeks so i ask her whats going on & watt about us. she told me that as far as we go this is it because her friend died & life was to short for us to keep trying to make it work. i was trying to explain how i felt she said all of this means nothing to me. this is it rite here, i dnt want a response back none of that & as far as we go this is it. all this occurred while we where texting each other & then like four days later i see her with her ex & others just chillen & now her and her ex are all buddy buddies again & he cheated on her 1st time which allowed me to go after her. TOP DAT OFF NOW HER FACEBOOK SAYS IN A RELATIONSHIP WITH SOME GUY I NEVA SEEN OR HEARD BOUT IONNO WTF 2 DO!!!