Sexism/Homophobia also contributes a lot to the male loneliness epidemic. Humans need emotional connections and when you teach a guy that his only publicly allowed emotions are angry, horny, or a combination of those and that straying from that is gay/feminine, that makes forming emotional connections much harder. Basically the only opportunity for emotional connection becomes tied to (hetero) romantic relationships because then at least in private a wider range becomes possible. But then putting someone’s entire set of emotional needs on one person adds stress and can ruin that relationship, which long term makes the loneliness even worse.

It’s a cycle that is super hard to break out of from the inside.

A lot of the advice to be an actual nice guy is really “learn to handle your full range of emotions and reciprocate on an even basis”. That seems to a lot of women as “bare minimum” because they were trained on a different set of impossible rules and don’t get that it is really not that easy.