Despite saying that he still fancied girls in his coming out video last year, Tom declared "I am a gay man now" during an appearance on ITV2 show Celebrity Juice.
The Olympic diving champion also said that his relationship with director and producer Lance is "all good" at the moment.
Tom Daley and Dustin Lance Black
It was Tom's relationship with LGBT rights activist Lance that prompted him to come out in December 2013.
Tom released a YouTube video to his fans, which he circulated on Twitter with the caption: "Got something I need to say...not been an easy decision to make, hope you can support me!"
He began the five-and-a-half minute clip by saying: "Most of you are probably wondering why I'm doing this video. My life's been a bit of a rollercoaster to say the least.
"In spring this year my life changed massively when I met someone, and they make me feel so happy, so safe and everything just feels great," he added, before revealing: "That someone is a guy.
"It did take me by surprise a little bit. It was always in the back of my head that something like that could happen," Tom went on. "But it wasn't until spring this year that something just clicked. It felt right and I thought 'Okay'. And my whole world changed there and then."