Te habeo, certus, ut abscedere possis. Te amo, certus te reiturum esse, ergo nos felices fore.
Remarks about the translation
Certus (m) -> if the loving person is male. certa (f) -> if the loving person is female.
reiturum esse (m) -> if the beloved person is male. reituram esse (f) -> if the beloved person is female. ------------ Bridge from Lilian:: x I have you, certain that you may leave. I love you, certain that you will come back so that we'll be happy.