Charmed

 "In the Charmed universe, the love between Cole Turner and Phoebe Halliwell is considered one of the most tragic but also the most profound love stories.

The Power of Love

From the first time he met Phoebe, Cole – who was half-demon Belthazor – was attracted to her warmth and pure heart. He loved not only her beauty but also her courage, kindness and strong belief in goodness. That love was great enough to make Cole fight against his demonic nature many times, choosing to stand by Phoebe even when it cost him.

Sacrifices

Cole proved his love many times through sacrifice. He tried to give up his power, finding a way to become a normal human just to be able to live a simple life with Phoebe. When he fell into darkness and became The Source, what tore him the most was not power but the fear of losing Phoebe's love.

Endless Pain

Despite their deep love, they are always placed in harsh circumstances. Phoebe struggles between her heart and reason, and Cole, despite his extreme love, sometimes cannot escape the darkness of fate. Therefore, their love is full of tragedy - where love is so strong that it transcends the boundaries of good and evil, but in the end, it still cannot lead to a happy ending.

 It can be said that Cole's love for Phoebe is unconditional, intense and eternal. It makes him one of the most complex and pitiful characters on Charmed - a man caught between his eternal love and his demonic nature."