I'll try to supply a contrarian opinion,
Hope mods don't ban me for this purely intellectual exercise.
I think this guy should count this as a blessing. Because:
1-- all post-puberty foids experienced Chad's dick.
2-- all foids are biologically wired to seek Chads' dick.
2.1-- a foid in a relationship with a beta will still crave Chad's dick (corollary of 2)
2.2-- a beta male is under constant threat of cuckoldry from Chad. (corollary of 2)
3-- he, as a good beta male, is driven to desire a relationship with a foid.
4-- a dildo allows the foid to supply (even if only partially) her craving for Chad cock.
5-- (conclusion) her having this dildo may well serve as a pressure release valve for her cravings of Chad dick. "Trasitional object" is the psychoanalytic term that Freud used. Therefore, her using this dildo decreases his risk of cuckoldry by satisfying, through her fantasy, her cravings for Chad's cock.
What this guy is suffering about is because he would like to be, as a beta, more sexually desired than her alpha boyfriend. (Not gonna happen).
He would like to replace the Chad (throw away the dildo) by being a better Chad in her life (so she doesn't crave the dildo anymore) but he can't, as he's a beta.
His biological role is not to satisfy her lust for alpha fux, but instead to betabuxx her and her kids through life.
His pain may well be gone as soon as he realizes his role as a beta and the blessings that come with it: he's not damned to be sex-starved forever like an omega male, and he may well be lucky and eventually breed, and have a family.
His desire to be more alpha than her previous boyfriend is the true source of his pain.