The catch is that the love bomb goes away, and you become devalued after the love bomb. This is usually followed by a “discard phase”, where if you try to confront the behavior, you are rejected and made to feel at fault. After you’ve become upset by this, they will often start the cycle again to keep your loyalty.
To add to this point, to maybe enlighten people who haven’t experienced abuse and don’t understand how someone wouldn’t notice this or leave once they do - while love bombing you, an abuser will also slowly isolate you from everyone in your life you would turn to for support and make their opinions of the relationship seem unreliable.
Phrases like “it’s you and me against the world”, “no one understands us”, “they’re jealous of what we have so want to break us up” are big red flags because they’re the foundations of destroying your trust in anyone but the abuser, and making you entirely dependant on them for validation, which when not love bombing, they will deprive you of to break you down further (gaslighting).
Love bombing is the first step towards coercive control.