Love hurts, and divorce hurts too, especially if you're so self-absorbed that you have no idea what's happening. Moving on also hurts when you're completely clueless about how regular people in society operate. "Love Hurts", the film, is a comedy, but it also hurts because the hackneyed jokes are more painful than funny.
None of the characters (the ex-wife, the sex-crazed assistant, or the candid son) were thought out at all. They were empty, annoying, and unintentionally more clueless than Ben, our "hero". I came close to liking Ben. Richard E. Grant can pull off sarcasm with aplomb, and he has a look that you can laugh at even when he's drunk and contemptible. But it takes a significantly better written film than this to successfully have an anti-hero hero.
"Love Hurts" doesn't have anything original, and nothing particularly funny. Most characters didn't make much sense, but they also weren't written as people, they were walking, talking jokes—which unfortunately didn't even provide any laughs. Grant brought everything he could to the character of Ben, and you can almost watch the film for him, but I would just recommend finding him in something else instead.