Looking for a song

I've heard this song multiple times by now but i can't make out enough words to find it by myself. Here's what i have:

The song is sung by a female and a male. The song has a really light, easy-to-listen kind of tune, something you would associate a nice summer day with. The chorus is sung by the male (at least from what i remember) and starts with the words "I don't know what you want from me".

Would be awesome if anyone could help me out as i've been trying to find it for a while now.