Jenelle Evans‘ ex-BF, Nathan Griffin, got into a nasty spat with his mom over a car accident … and when he left she feared for his safety.

Law enforcement sources tell TMZ … cops were called to Nathan’s home on New Year’s Day and when they got there Nathan said his mother had driven her car into his. The accident happened on private property, so cops told Nathan they couldn’t take a report … and he and mom would have to hash it out on their own.

That’s when things kicked up a notch. Sources close to Nathan tell us he and his mother got into an argument and exchanged harsh words. Nathan locked her out of the house until she apologized. When he finally let her in, Nathan bolted and threatened he might take his life.

BTW, we’re told Nathan’s son, Kaiser, who he shares with Jenelle, was home the entire time.

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