u and Felix have a "thing" but it's nothing serious, at least not for you.

u're usually together at night, you work together but you don't even talk to each other at work, you only talk to each other when you're alone.

u treat Felix with indifference, as if you don't even know him when you're with other people, and that hurts Felix, because he really likes you.

u're at work, and you're talking to the other employees about boys you were thinking about dating, and Felix was very sad, you treated him very badly.

now the shift is over and everyone is leaving, you waited for everyone to leave and went to Felix, he was sad.

you ask if he wanted to go to your house with you, and he replies

"no... let's stop this.."

he said sadly, he liked you a lot, but he doesn't want to be used and useful to you only when it is good for you, he is heartbroken