AITA if I invited another girl into my house after me and my ex gf broke up?

I (18m) and my ex (17F) broke up awhile back, id say about 3 months ago. We go to different schools, but around the same area. She broke up with me because we had a few problems through our relationship. Anyways, we still texted and called each other. I had been wanting to get back together ever since, but she wanted me to show her that I really meant it. After that talk with her, things changed. I tried my hardest, everyday id wake up early to text her good morning, and try to call and text her all the time, basically what I used to do before we broke up. Although I have been trying my hardest, she didn't put any effort at all. She left me on read for days at a time. She never used to do this, even before we got together. So I stopped texting her, it has been about a month since we last texted. But a few days ago I invited my friend, KC (cover name), over to play some video games. KC is a friend from school, I wouldn't say we are pretty close but we talk a lot about video games. I also met her girlfriend which I wont deny being around them made me feel very single. But she came over and we played video games in my living room. She had posted a story on Snap and Instagram of me and her playing video games. Nothing romantic at all about it, just me on the floor playing cod zombies. Yesterday I woke up to multiple texts from my ex saying how betrayed she felt, that I had given up on her so easily. I love this girl to death, and I truly mean that, but she had left me on read multiple times and for days at that. I told her that me and KC are just friends multiple times. After that, I got texts from her friends saying how much of an asshole I am about having KC over.

AITH??