Namorar and the various offshoots have several meanings, so let’s take a look. 
1. Namorar (I)
This means dating.
Estamos namorando tem um ano.
We’ve been dating for a year.
Estavam namorando mas terminaram.
They were dating but they broke up.
2. Namorar (II)
This means cuddling, snuggling, showing affection or caressing.
O casal jovem está namorando na praia.
The young couple is cuddling on the beach.
Os ingleses não estão acostumados namorar em público. English people aren’t used to showing affection in public.
3. Namorado/Namorada
These mean boyfriend and girlfriend respectively.
Ela não tem namorado. She doesn’t have a boyfriend.
4. Namoro
This means relationship or period a couple has dated.
O namoro deles começou no colégio. Their relationship began in high school.
Nosso namoro durou cinco anos. Our relationship lasted five years.
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