hi, is this okay to read? tragedy? heartbreak at the end? pls tell me now cuz i dont wan...

Considering it's not finished, I cannot say. But ive just binged 54 chapters, and it's a compelling story.
The ML might come off as horrible and the s3x scenes in the beginning aren't great consent wise (but that's the norm with manwha these days) but it's still good.

Don't know if that helps(￣∇￣")

Is the ML a whore who sleeps around st the beginning?

Not at all, no one cheats!
Maybe some would say there's emotional manipulation (ive seen that written a few times) but i would say the relationship seems forced initially until you understand how and why things are the way they are

Thanks!