It's interesting about Ekin-Su. She has literally just promised Davide that she's a reformed character and won't stray again. I think she's mature enough to understand that if she does go off track again in Casa Amor then everyone, including Davide, will lose faith with her. So I think she'll stay loyal.
Davide, otoh, hasn't made any promises to anyone. His position around Ekin-Su seems to me like bemusement or bafflement. Basically he isn't as fussed as she is! His head could be turned if there is someone fairly cool but younger than him and stunningly attractive coming in.