I agree with the above comment that the best mixtapes are a way for you to express how you feel about the other person through songs you know well. You won't have the immediate emotional connection to these songs that makes the mixtape special to the person receiving them.

That being said, I love the 80s so I'll try to help out.

Your Love by the Outfield is a great song, but the vibe might not be right if they listen too closely to the lyrics.

Ah! Leah! By Donnie Iris

Time After Time - Cyndi Lauper

Heaven - Bryan Adams

I Want to know What Love Is - Foreigner

Keep On Loving You - REO Speedwagon

Kiss Me Deadly - Lita Ford

Sexual Healing - Marvin Gaye

Take My Breath Away - Berlin

Total Eclipse of the Heart - Bonnie Tyler