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Casey Aldridge is not a nice boy. (InTouch Image)

Pfft, and they said it wouldn't last! Oh, wait, it didn't. You can now stick a fork in 'em because it looks like our modern day Romeo and Juliet are done.

In Touch is reporting that Jamie Lynn Spears' fiance Casey Aldridge, has been cheating on her with a 28-year-old woman.

Kelli Dawson has now cashed in on her shittiness and sold her story to the gossip mag — and it doesn't look good for the two-timing Aldridge.

"We were both really attracted to each other,” Kelli told In Touch. “He totally instigated it and pursued me. His friends would tell me that he liked me, that he thought I was pretty.”

Kelli claimed that she and Aldridge stopped sleeping together a few months before Jamie Lynn gave.

“It just didn’t feel right,” she said. “He had to deal with the baby coming, and it had to stop.” She says the last time the couple had sex together was in March but “even after we stopped having sex, we would still kiss occasionally.”

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