Country singer Jana Kramer has separated from her husband, former NFL tight end Mike Caussin. It is being reported that he has entered a rehabilitation center for undisclosed reasons.

"This has been difficult for Jana but her priority is being there for [7-month-old daughter] Jolie," a source close to the singer tells PEOPLE.

Caussin, 29, retired from the NFL in 2015 after a knee injury followed previous hip issues and a torn ACL.

"I've never been more proud of my husband for his grace and strength departing and leaving a job he loved so much, but injuries plagued his future,"  Kramer wrote in her blog at the time.

The 32-year-old One Tree Hill alum and Caussin began dating in August 2014 and he popped the question a short four months later. The couple got married in Charlottesville, Virginia in May of 2015.

Then in January of this year the couple welcomed their first child, daughter Jolie Rae.

Kramer is currently on tour supporting her latest album Circles.

"The constant variable in all of this has been Mike. He has been insanely caring, reliable, and to see him with our daughter makes me melt," she wrote in a PEOPLE blog about life on the road. "I can't wait to see the relationship they build and for him to show her how a man should treat a woman."

If you're scoring at home, this is the third marriage for Kramer and the first for Caussin.