What happens to Robbie on seventh heaven?

In the television series "7th Heaven," Robbie Palmer, played by George Stults, becomes a recurring character who is the love interest of Lucy Camden. He faces various challenges, including family issues and personal struggles, but ultimately grows and matures throughout the series. His character undergoes significant development, particularly as he navigates his relationships and responsibilities. Eventually, Robbie becomes a more integral part of the Camden family dynamic, especially after marrying Lucy.