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Was it because he bought a house with his mom?

“Saturday Night Live” star and comic Pete Davidson, 25, and actress Kate Beckinsale, 45, have split.

The improbable showbiz couple that was Deckinsale has sadly cooled things off after just a few months of dating, sources confirmed to Page Six.

One insider said that while the age difference wasn’t a problem for the pair, Davidson’s public lifestyle was.

“Even though Kate has been in Hollywood for a long time, she struggled with the attention on her relationship with Pete. He lives his life with his heart on his sleeve.”

Despite a very public makeout session with Davidson at a hockey game, Beckinsale — who got together with him at the Golden Globes in January — told the LA Times, “I’m surprised by the interest. I’ve never been in this position before — never dated anybody who comes with their own bag of mischief.”

Between breaking up with Ariana Grande, amplifying the debate about the size of his manhood, marking up a host of tattoos, joking about his love life on “Weekend Update” and moving in with his 50-year-old mom in Staten Island, Davidson is indeed a dream for comedy writers and gossip columnists — but a horror for Hollywood publicists.

Their reps didn’t comment.