After separating from his wife, Charlie dated his HTGAWM co-star Liza Weil, an actress best known for her starring role as Paris Geller in the WB/CW comedy-drama series Gilmore Girls and its Netflix revival series Gilmore Girls: A Year in the Life.
The actor eventually spoke about his relationship with her during a conversation on the Allegedly with Theo Von & Matthew Cole Weiss podcast on July 5, 2017.
"We're very like-minded when it comes to our approach to acting," he said about dating his co-star. "We're two actors who are very dedicated to what they do and have a very easy time separating who we are and who we are as characters."
He then shared that their relationship developed "naturally" while on set.
"We were great friends and we found ourselves in a position to be more than that," he added. "You spend a lot of time [together] and we, I very much enjoyed spending time away from work and so it all just kind of came together like that … I'm very happy."
Before the start of the relationship, Liza had also ended her nearly ten years of marriage with actor Paul Adelstein in April 2016.
However, the relationship between Charlie and Liza didn't go the distance as well, as they reportedly broke up in February 2019.
Charlie is now private about his love life, keeping his fans unaware if he is together with someone.
Meanwhile, he is also a father to an around 17-year-old daughter, whom he welcomed with an undisclosed partner before marrying his former wife Giselle.