You've become everything to him.

After Sasha disappeared and many attempts to find him, Anton gave up. He had no hope of finding him. And strength, too.

and so...

at such a difficult moment in his life, you appeared...

You were like a ray of light emerging from dark clouds. You supported him, you were always there for him...

At the moment you are standing at Anton's door, getting ready to knock and looking forward to the fun of the sleepover.