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The 21-year-old Into the Storm star reportedly split with his girlfriend, Madisen Hill, after four years of dating, according to JustJaredJr.com.
Although Nathan hasn't directly addressed their break-up, the former iCarly actor gave fans a big hint that he was single when he tweeted Sept. 28, "Foul bachelor question: If pizza has been in my fridge for 10 days, but still smells great... Can I eat it? It's REALLY good pizza."
Nathan and Madisen reportedly met at a benefit concert for Haiti earthquake victims and were last spotted together back in June at a Dodgers baseball game.
Aside from pondering about chowing down on days-old pizza, it doesn't look like Nathan is letting their split get him down. The thesp recently returned from Oahu after filming an episode of Hawaii 5-0. "Life is just really, really good. I don't deserve this," he tweeted while he was there.