And he said,
To buy a ring is simple and easy,
But to wear the ring is hard and heavy.
If u manage to wear it, u will realise how nice/pretty it look on you.
It means,
to get hook up with a girl/boy is quite easy,
but to hold and endure with the partner is difficult.
But if u manage to endure,
U will realise how happy u are with her/him.