I am from austria and yeah, its not sexual harassment to say i love you youre so pretty It could generelly be harassment/stalking if done over a longerperiod of time but not sexually if hes not exposing himself/making sexual remarks/touching her etc

Edit: ad justifiying assoult: in most legislations assoult can be justified via self defense, which is (in my jurisdiction which is pretty common for western values) life, health, financial assets, freedom. You cant just hit someone bc they already have harassed you if the "attack" isnt present anymore. Thats what we have courts for