What kinda "love" we talking about here? Lust? Admiration? Everyones favourite, unrequieted? Self destructive?
Way I see it, love songs are either about the subject ("You're so beautiful") or about self ("You make me feel yadda yadda"). What do you want to say?
As to not being cheesy...not easy. Like Corsair said, love is a subject that's been written about maaaany times in the history of mankind. All I can say is try and get some sincerity into whatever you're writing. If you believe what you're saying, so will the listener. Diane Warren wrote (and Celine Dion performed) Because You Loved Me about her father and all the support he gave her in her life. Now it gets sung in a romantic context. Yet know one notices the past tense of the song (Loved), because she genuinely felt every word of it.
Here's another example of what I mean
Unique? Yeah. Sincere? Yeah. Cheesy? ...well, yeah. But I'd put it at the Mascarpone mark