Valerie Bertinelli “can’t just blame” her ex-husband for their “toxic, horrible marriage”. The 63-year-old actress acknowledges that Tom Vitale wasn’t entirely responsible for their failed marriage. During an appearance on ‘The Drew Barrymore Show’, Valerie explained: “I can’t just blame my ex-husband for a toxic, horrible marriage. It’s not his fault. “What led me to that? Oh, childhood! That’s the stuff I got to start working on. “I’ve found that when my gratitude is really placed in even the challenging, hard times, that’s when the growth really happens.” Valerie – who was married to Tom be…