What a surprise! “Teen Mom 2” star Jenelle Evans has decided to end her relationship with on-and-off boyfriend Gary Head and call off their engagement only two weeks after she so happily and proudly showed off her engagement ring on Twitter.

‘Teen Mom’ Star Jenelle Evans Tweets Racy Bikini Pic (PHOTO)

Apparently, Jenelle was furious when she found out her man hooked up with another girl while they were on a break, which makes no sense since she was also dating another guy named Kieffer Delp.

Teen Mom’s Jenelle Evans Engaged To Gary Head (Engagement Ring Pics)

The 20 year-old mom took to her Twitter to rant about her ex-fiancé and accuse him of stealing one of her necklaces, a $300 Tiffany piece. On the other hand, she has every intention to keep her engagement ring and not give it back to Gary because she can. And that’s how the Twitter feud between them started.

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Jenelle tweeted, “Thanks to Gary Head for stealing my $300 Tiffany necklace . . . What marine does that?” On the “stolen” necklace, Gary said, “It will probably look better on Hannah[Inman, Jenelle's roomate] anyways for you taking her clothes. She would love it.”

“Yupp that’s what my “fiancé” just said to me, how caring. Bawling my eyes out at the top of my lungs,” Jenelle, the drama queen said. Gary promised to give Jenelle her necklace when “I get me ring back.”

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Jenelle: “If u never went and cheated on me…. then I would trust u more.” Gary: “Cause you have a reason to be jealous over Chelsea [Chelsea Houska, Jenelle’s co-star]? I don’t even know her. I just made a comment.”

Jenelle: “I’m not jealous of anyone and never will be. I can’t trust u talking to any girls.” Yep, that sounds like a jealous girlfriend to me. As for the ring, the teen mom claims she talked to the police and it’s hers to keep, unless Gary wants to take her to civil court to fight for it.

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Oh, young love! I give Jenelle and Gary a week. If they are not back together then Jenelle will be dating some other guy, getting engaged, ranting on Twitter, getting into fights over guys, whatever. Jenelle is setting such a great example for her kid.