The title is so great, because it really makes it sound like you're going to get some lighthearted fluffy romantic comedy… and instead you get two half siblings wrapped up in a nasty codependent romance that they can't seem to give up.
Anyway, despite seeming kind of misleadingly lighthearted, it's actually a pretty apt name, 'cause Eddie, May, and the Old Man are all "fools for love" in their own ways. Love seems to make them do things that don't make any sense. If that's not "foolish," we don't know what is.