Being able to forget her face is a clear indication by the mangaka saying that by not remembering her, her relevance in his life has faded. Back when he hated her to a volatile extent, he was literally trying to repress her constant image in his head. Now even if he tries, he can't piece together her face.Being able to forget her face and her not influencing him any longer are two very different things. We are who our upbringing and surroundings turn us into. If not for her influence he would probably living a happy life with a family, instead he is here alone. I wouldn't say the result seems like a happy life, so more as it is a content one. Yes he has moved on but stuff like that stays with you regardless.
Also, he lives his life doing what he wants, how he wants. He's picked up hobbies that he enjoys, he observes his surroundings with appreciation. What more should the mangaka show to make people believe he's happy. And yeah maybe a family would've made him happy too, but family doesn't equate to happiness only. But I can admit that him not being too social or having a family could be because his own family fucked him up, lol.
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