I think it's probably more like he means that what he hoped for happened.
As in, he hoped that his crush would change his misconception about love and understand it properly; and he did change like this; so tatsumi says that what he hoped for happened (aka. The change he wanted did happen).
The wording of this phrase sure does sound a bit disturbing and manipulative; but in tatsumi's case, he is by no means manipulative and he is actually very respectful. So in conclusion, I'm willing to understand the best case of this phrase because I love this darling so much hehee
You're absolutely right! The wording seems weird sometimes, but he only did and helped with his best intentions and cause he loved him sm.
It's a translation issue. Not that they didn't do great but some phrases in Japanese are hard to put into English.
I agree on this take, thank you for sharing this.
Loved the message and all that, it's not problematic at all, but Christ on a stick is the line "He changed just the way I hoped :)" icky. Like you could've worded that better my dude.