If you address your partner as tu/tum. You need to be thrown in elementary classes again to learn some respect.
Respect is ALWAYS mandatory in any relationship
Doesn't matter if your partner is younger or older than you, aap is x100 romantic than being a street whore&using tu/tum
You know those couples who refer to each other as "aap"? I don't know why but it's so weird to me, you guys are in a relationship, not an arranged marriage setup