The 25-year-old back up dancer is looking for a place of his own and is worried that Lopez, 43, is growing tired of him, reported Showbizspy.
"He is with Jen and her kids so much. He wants to have a place he can go to in case this comes to a screeching halt," a source said.
Meanwhile, Lopez apparently burst out laughing when Smart suggested they get matching tattoos.
Casper is desperate to tie the knot with the three times married star but instead of buying her a ring, he suggested they get inkings affirming their commitment on their ring fingers.
Lopez, who started dating Smart after splitting from third husband Marc Anthony, the father of her four-year-old twins Max and Emme, recently said that she is not ready to tie the knot with her partner, though they are very happy together.
