I cannot remember much about this story except from a few facts no specific order

medieval type fantasy

witch/sorceress believes she is wronged by king, curses a royal child

curse can only be broken by a selfless act

monarch's magic is life of land

A friend of MC runs a clinic that soldiers burn to ground with patients still inside

another character saves MC from making bad mistake, and turns MC's life around, think is mercenary and teaches MC swordsmanship

MC is in love with only female friend who is in trouble with a guild, thieves guild I think.