Why do some people lovebomb too much if they're going to then break-up?

For instance, if someone says ''I love you so much, I can't imagine my life without you'' but then they break-up over an argument or something trivial then their words meant nothing.

They went from ''I can't imagine my life without you'' to ''it's over''. That's a radical change (that's like getting praised in your job one day and the next day getting fired) and they just contradicted themselves... so they can live without perfectly. Then suddenly all the pictures you shared with them on FB or other social medias goes to the trash. All for nothing.

I believe some phrases are overrated. What's the point of giving hope to the person and lovebombing too much if you're going to break-up?

Why do some people lovebomb too much if they're going to then break-up?
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