Just tell him/her that you love her/him. =)
For me, mas sweet parin yun.
I remember last New Year 2009, My ex (now my husband) and I are talking to the phone. Friends palang kami nun. We we said goodbye to each other, I told him (I love you). Tapos, nagkunyari pa siya na hindi niya narinig. Ayun, sinagot ko siya that very moment. =)