As a second thought, cross out Obvious Child, it's more a chick movie, although well written and very well acted, and it's not really about love. Instead, watch Scott Pilgrim vs The World if you haven't watched yet it's a comedy, has romance but it's fucking amazing funny hilarious and unique, directed by my one of the best modern directors Edgar Wright (Baby Driver, Shaun of the Dead, Hot Fuzz)
There are also several very good movies about love that aren't comedies — Her, Eternal Sunshine of the Spotless Mind, Before Sunrise. If you like any of these three movies, watch The Dreamers, it's very intimate, very nostalgic and very bohemian and has young hot Eva Green in her best role ever.
To be honest I'm just so passionate about movies can write a fucking essay on them.