1) Buff 2) Casanova 3) Casanova wannabe 4) Devotee 5) Don juan 6) Don Juan or Casanova 7) He lives for love 8) Love lover 9) Lover 10) Romance writer 11) Romeo 12) Smitten one 13) Writer about love Found on https://www.crosswordclues.com/clue/amorist
Am'o·rist noun [ Latin armor love. See Amorous .] A lover; a gallant. [ R.] Milton. « It was the custom for an amorist to impress the name of his mistress in the dust, or upon the damp earth, with letters fixed upon his shoe. Southey. » Found on http://www.encyclo.co.uk/webster/A/71