Is it really worth it?

Potato🥔

We remember the Freeman.
We are coterminous.

also i was wondering how are they hostile on half life but they're friend in half life 2?

Because the Vortigaunts were enslaved by the Nihilanth from Xen, and forced to attack humans.
After Gordon killed the Nihilanth, he freed the Vortigaunts and they made peace with the humans