They've barely said a word about their on-again, off-again relationship, but by now there's no doubt that Jennifer Lopez and Casper Smart have definitely been enjoying the last several months by being together again. Unfortunately though there's a new report that suggests Lopez might have dumped Smart after she promised to include him on the cover of a magazine. The singer and actress supposedly used another man instead.

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According to Naughty Gossip on Friday, Lopez decided not to go with her back-up dancing boyfriend and used designer Olivier Rouseing for the cover of Paper Magazine.

A source told the site, "Lopez promised Casper he would be on the cover with her but dumped him for her fancy designer pal. He was pissed. Casper loves the attention and press as much as JLO does."

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Even though Lopez and Smart seem to be "back on" again, it doesn't look like they'll be getting married anytime soon. Sources say that even though Smart proposed to Lopez, she wasn't willing to make things official with him.

The site says that after "several proposals" Lopez simply told him that it's "never happening." The Latina beauty was previously married to Marc Anthony from 2005 until they separated in 2011. They share custody of their twins Max and Emme together.

So far Lopez herself has not made any comments about the report.