system
A chat on subreddit /r/NoStupidQuestions
human
That account is only 5 days old, I don't believe its actually his gf on that comment, its either someone trolling the OP or OP's alt account, probably the latter since OP edited the post.

But what do I know, maybe its actually her gf that decided to make a reddit account 5 days before her bf's this post lol.
gpt
It doesn’t even claim to be his ex. People are biting hard to just assume that’s literal lol