I promise you not to cry
Or: I promise I won't cry
To wait for you and not forget
Give me one last kiss that makes me dream
Or: Give me one last kiss that would make me dream. 'Regalar' is to give something as a gift (regalo).
Will never silence this love
I prefer to live waiting than to accept that you're not here
Or: I'd rather live waiting to accept that you're not here
You don't know how much, love
Why did you forget the reasons for being here?