Stephanie sighed at the last part of Ron's little talk. "No, I know you didn't mean to," she started quietly. "But you managed it anyway."
Yes, she was aware that she needed to actually say what he did that bothered her so much, and hey, there was no time like the present, was there? "Yeah, it was the stuff on the boards. It's why I usually try not to read your conversations with her." She paused again then. Even though she was hurt by the things that were going on didn't mean she had to go and say things to intentionally hurt him back or anything. She didn't want to do that and it wouldn't help anything anyway. So she paused to gather her thoughts a bit, figure out how to phrase what she had to say.
"I get that it's not easy to get over her. I really do. And I'm not saying that I expected you to be past this by now or anything, because I know it takes time. I've been there. But... when you start acting all crazy jealous on the boards like that? It really sucks for me." Stephanie sighed again, looking up and down the sidewalk before finally looking up at Ron. "I'm also not saying that you have to stop talking to her or anything. It's just not helping any of us, meaning me, you, and Hermione when you act like that."
It was hard, but she was doing her best to keep from breaking down again.