not in love. wholehearted; sincere.
… it may be said of him that Cupid hath clapped him o’ the shoulder, but I’ll warrant him heart-whole. –William Shakespeare, As You Like It, 1623
“What,” said he, “have I flirted with so many girls in my own way of life, and come away heart-whole, and now to fall in love with a gentlewoman, who would bid her footman show me the door if she knew of my presumption!” –Charles Reade, Put Yourself in His Place, 1870
Heart-whole came to English in the 1400s from late Middle English.