I think unrequited love is denoted through writing out the feelings of most usually longing, sometimes abandonment, and pain. There can also be the feeling of loss. The best piece of advice that I've received and that I would like to pass on is: go through it. But in all honesty, that piece of advice was given to me for all writing. After all, writing based on experience is much more straightforward.

Emotions are difficult to portray through words a lot of times, and that is because emotions rarely make a lot of sense. There is no logic to be found in them, especially in love. I personally think that the most reliable way to truly understand what love is like, or what unrequited love feels like, is to go through it. Not that I would wish for someone to go through all the pain that a love unrequited brings.

Further, I think there's this idea that some people have that love is all flowery, and thus should be portrayed as such. I think that to properly tell any tale revolving around love, the thorns should be shown to the reader as well, and not just the rose petals on top.