Justin and Selena: Not looking good

• Justin and Selena argue and storm off
• She locks him out at the gate to her house
• Paparazzi cameras keep clicking

Speaking of true love, the course is definitely not running smooth for young lovers Justin Bieber, 18, and Selena Gomez, 20.

Their rocky relationship — is it on, is it off? — seemed to go over a cliff this weekend, according to TMZ, People and others, when they got into an argument at a restaurant,stormed out looking angry after a few minutes, and left in separate cars. He followed her and when she got home, she wouldn't let him in the gate.

This was Friday night at Yamato, a Japanese restaurant in LA's San Fernando Valley, and it was just a few days after reports said the two were getting their two-year relationship back together after a split this month.

Naturally, the paparazzi were watching; TMZ even posted a pap snap of Bieber, looking ticked off, getting back into his white Ferrari outside her gate. TMZ also described their argument as "epic" and "nuclear."

Plus, this was just a few days after bad news for Bieber: The case against a paparazzo charged with recklessly pursuing him in a car was dismissed as a threat to the First Amendment, thus jeopardizing California's unique anti-pap law.

Early Saturday morning, Bieber tweeted a message to his 30.3 million followers, People described it as "cryptic."

"Things arent always easy," he wrote. "there is a lot of pressure. im figuring it all out. im trying. but i care, i notice, i still hear u. #Beliebers"

True, relationships aren't always easy, especially when you're just 18 and TMZ and the paparazzi and the entire gossip-media universe is watching your every move, not to mention the waiter serving your sushi.

On the other hand, fame and fortune is the reason you can drive a Ferrari and live in a gated mansion.