Responses
I agree whole heartedly, however if he says smth like "i cant date you" she's going to ask why and that's going to lead to more confusion especially if he hints at his mental age
I think the issue is that it's only half true. From what I've read, she is an important person to him. And even a likely romantic partner. The only thing holding him back is the age at which he died in his first life. But he was shy and cute when she took the initiative to kiss him. I love that she's calling him out.
He could just say “sorry I was an ass, but I really only thought of you as a friend” and then after that if she pushes it even farther then she is out off line. He shouldn’t need to divulge his deepest secrets (his reincarnation) just to reject this girl. Whether he tells her his true age or not, he morally wont allow himself to date her, and I think she should respect that.