It looks as though Jennifer Lopez had a solid reason as to why she pulled the plug on her relationship with ex-boyfriend Casper Smart. According to a new report, Smart was allegedly very jealous when Lopez got a little too up close and personal with her co-star Ryan Guzman.

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Radar Online reports on Wednesday that the ex-couple fought on several occasions because Smart believed that Lopez was too close with her The Boy Next Door costar Guzman.

An insider tells the website, "Casper would get very jealous and possessive of Jennifer while they were filming this movie because Ryan and her got extremely close."

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What's more, Smart was apparently present whenever Lopez and Guzman would film their love scenes, despite the fact that it filled him with even more jealousy.

The source added, "Casper would come and watch Jennifer film love scenes with Ryan and it drove him crazy. And for good reason... the chemistry between Jennifer and Ryan on and off screen is undeniable!"

Meanwhile, Lopez has recently admitted that she is still looking for "the one" man in her life in the latest issue of Elle UK.

The 45-year-old said, "I still believe in love. The nirvana man, he's out there somewhere. But you just have to work at it. You have to work at everything."

The mother-of-two added, "Everybody has seen that I make mistakes. I rush in, I get swept up and I ignore the signs. But so many of us are guilty of these things. Each time it goes wrong, it's hard. I get really hurt but I have to let myself go: 'What did I do? What can I learn?' And as hard and as hurtful as things get, I want to believe I will be able to go one step higher. I've got to hope that if I keep going I will eventually get it right."