What is wrong with my gf and what should i do?

So one night my gf texed me asking what i ws doing and i told her i was heading to be because i was tired. From then on, she never responded to me. few days went by, i called her and apparently her phone is off because she didn't pay her bills. So anyway, i was in this chat-room one day and surprisingly she was in there. so i was watching. This one dude told her she was mad because i dumped her i didn't) and that she should stop being childish and act like the adult that she claims to be.The dude also said she wanted him to meet her and he declined. Then she goes "yea im an adult hes not"(referring to me)wtf i was shocked. For this reason i have not contacted her yet. why did she say that and what should i do.