Help

Hi, this might be a long one but imma try to make it short. Im posting this here because i believe in TRP since i experienced the most of it but im new to it. So basically it’s about a long distance ex gf that also was my friend since childhood, our relationship was pretty toxic, and i was a real beta back then, (not that im alpha now but im working on it) anyways i had a hard time getting over her but after a couple of months i started hitting the gym, taking care of myself, traveling with friends and with time i totally forgot about her. But this past month i been having a hard time, me and my friends stopped talking, im feeling more lonely but still hitting the gym as usual and trying to better myself so then she popps up from nowhere replying to a story of mine i posted on instagram while at the gym, anyways i replied back ( which i shouldnt have) and we continued to talk back and forth, sometimes she’s trying to argue, i told her i wasnt gonna argue with her anymore. I dont have feelings for her anymore but there is just something that makes me wanna keep replying back to her messages, i guess that is because im feeling lonely lately. Now after she didnt reply back to smth i said for like a day, she hit me back up and i just want to know what to do and some advice from you that knows more than i do.

Thank you