1) when you tell him you love him and he says "thank you"
Says "I know"
Says absolutely nothing
Pretend like the cavity where your heart used to be isn't endlessly throbbing. Pretend like you don't crave the words, pretend like it doesn't hurt, pretend like you're not empty.
2) imagine, remember hearing him say the words back. Imagine, remember the way his lips feel pressed against yours. Imagine, remember the sound of his heart beating against your ear when he says your name. Imagine, remember the smell of him on your skin and clothes
3) when you see his family out in the town you can't leave, say hi. Smile, ask them about themselves. Hug his little sister. After 4 years, 3 months, 9 days (who's counting right) you've earned the right to be civil to them. You've earned the right to be friends with them.
4) after 4 years 3 months and 9 days, when you tell him you love him and he doesn't say anything... don't stop telling him you love him. Even though your heart belongs to him, even though the empty spaces in your chest hurt, tell him you love him again. Because maybe one day, he'll say it back.