For a while, he is in a serious relationship with Raj's sister Priya, but in season 5, he and Penny get back together, and at the end of season 7, he proposes and she accepts.
For a while, he is seriously involved with Raj's sister Priya, a successful lawyer, but she eventually returns to India. In season 5, he and Penny get back together, and at the end of season 7, he proposes and she accepts.