It's definitely a difficult thing to capture and I mean, I've seen a ton of movies where I've believed the couple and I've seen a ton of movies where I have not believed them at all. Unfortunately, as an audience member, you check out if you don't believe them.
As the actor, you just have to believe in what your character is doing in order to play them.
Every woman in her late 20s goes through a period where she just doesn't believe love is out there anymore, but it is. And I think the minute you stop looking for it is when it comes for you.