I think it was a shoujo manga where the girl wasn't planning to confess cuz she didn't really like the guy but ended up did it and the guys accepted. The guy was very quiet and awkward i think. And there was one time where the girl was planning to break up with him but ended up going to his house, she fell asleep and thought the guy drugged her but turns out the guy cooked dinner for her. And i remember that the guy don't know how to reply to messages and it took him all night to reply to the girl's message.
Sorry that it's kinda long but i've been wanting to reread this for a long time now ╥﹏╥ thank you~
Sorry following

FL's family was killed by the ML. Then she also died and she reincarnated into another person in the future (12 years later maybe?) Then she met the same ML (older now). He had taken over the FL's family castle or mansion.
The ML had a good reason as why he had to kill the family. Turns out he buried their bodies properly in the forest of the mansion/castle. And he eventually found out that the current FL was the same person he had killed. I remember that it was very sad.
Please help me find the title (=・ω・=)