In the last episode of the show, Williams's character Jackson ended up in the shower with Lexie (Chyler Leigh).
Speaking to Zap2It, Williams explained that he is looking forward to exploring Jackson in more depth because of the relationship.
"I'm excited as an actor going forward that he will have somebody he can speak to and maybe open up a little more," he said. "And get to see who this guy is and get to learn a little more about his past, and also get to understand better what he'll do in the future."
Williams also defended the romance after some viewers suggested that it had happened very quickly.
"I think some people might have received it kind of abruptly, like, 'Oh crap, they're in the shower hooking up immediately'," he said. "But I think if you reflect back on it as I've looked back on it, Jackson and Lexie have been around each other a lot and have come to rely on each other a lot and confide in each other."
He continued: "The next two episodes will deal with, 'Are they an item? Is this puppy love? Is this just a little lust, just having a little sex? And is this something that can really last?' The elephant in the room is Mark. Jackson knows that Lexie's been with Mark for a long time, has a history with him, went away from him, went back to him. He's going to have to deal with that. And everyone's going to be very aware and treading lightly and being careful about this."
Grey's Anatomy returns for a new episode on Thursday at 9/8c on ABC.
> Chyler Leigh teases 'Grey's' romance