Like beer goggles, relationship goggles are the perception distortions of those couples who seem completely mismatched but are so "in love" they don't see the other's faults. They only come off after the relationship has ended, leaving both halves to wonder why the fuck they ever got into that relationship.
bro #1: how come the hot chick is dating that fuckwad?
bro #2: c'mon bruh it's the relationship goggles
see also post-relationship regret