In the example below, why is it 'aprovechó' and not 'se aprovechó de'? It seems quite a negative context to me, and the context even seems to be leading us towards using the reflexive form by saying 'el muy egoísta'.
Rafa, [being] such an idiot, took advantage of the moment to break up with me. : Rafa, el muy egoísta, ___ la ocasión para romper conmigo.