It depends. Sometimes 'forgotten love' is inspired by true experiences, but often it's just a creative concept made up by the author. The line between fact and fiction can be blurry in such cases.
Most likely not. 'Forgotten Love' is probably a work of imagination crafted by the author to engage readers. Many stories like this are made up for entertainment and exploration of human feelings.
Perhaps the novel you're looking for is The Mysterious Wife: You're Under Arrest! In the story, the female lead, Nan Xiao, transmigrated into the body of an orphan girl and was later discovered to have lost her memory. The male lead was the devil CEO from five years ago whom she had saved. He had forgotten about her, but then he began to show gentleness and love for the female lead. I hope this novel is the one you mentioned, but if it's not, don't be discouraged. I have many other good novels to recommend to you. I hope you like my recommendation, Mwah ~
I'm not sure specifically as I haven't read it. But generally, a 'forgotten love novel' might be about a love that was once there but has been lost or overlooked, perhaps due to time, misunderstandings, or outside forces.
It's hard to say. Sometimes stories on Wikipedia can be based on real events but presented in a way that's not completely accurate. You'd need to dig deeper into the sources and references provided.