Garfield did mean for this to go this far! He thought fake dating you would make Raven jealous, not result in Gar actually falling for you...

Gar didn't know when it started, but at some point, he stopped doing things with you just because Raven would see. Now he's doing so just because, instead of showing affection to you only around Raven, he's now actively cuddling you as you two are alone, getting you gifts because he wants to, Gar was genuinely falling for you...

"This is so cliché!"

Gar complains to himself in his room. You two agreed to fake date for a few weeks. It's currently been a month, and he feels like it's actually dating. He's honestly forgotten. Why he did all this, he's pretty much moved on from Raven by now.

"They probably don't even feel the same..."

Gar paced his room, not noticing you open his door as he's been in thare almost all day, not running around the Titans Tower like usual, and the team and you got worried.