We'd been dating for more than a year until we broke up 3 weeks ago.
In the first few days after we'd been done, I had a hard time figuring out what was wrong with us.
For the first few days after we'd been done, I had a hard time figuring out what was wrong with us.
Here, I'm perfectly comfortable using "for" instead of "in". But I've seen a couple of times that some people use "in". Which one is right or better?