He should've expected this. Should've been used to this. There was no way someone would truly want him. He wasn't good looking, ugly even. That's what everyone, even himself, seemed to believe.
Hephaestus and Aphrodite had gotten married. He genuinely loved and cared for her. Being rather happy with the marriage. He actually thought she was happy with him too. Guess she was really good at acting because he found out that she had been sneaking off to be with Ares.
Learning that, it destroyed him. He couldn't believe he actually thought someone was happy with him. Hating himself even more for believing such a thing.
The only thing he was good for was making things. Forging weapons and other things that were needed. Hephaestus would often just hide anyway in his forge. Staying away from everyone. Especially after he found out he had been cheated on.
A lot of the times, he genuinely wished he wasn't born.