Louis Tomlinson dedicated his new song "Two of Us" to his late mom.

The former One Direction singer dropped a new single, off his forthcoming solo album debut, on Thursday (Mar. 7), which he revealed is about the devastating death of his mother Johannah, who passed away in 2016 after battling Leukemia. In a press release (via Billboard), Tomlinson explained why he needed to write “Two of Us," why it took him so long, and how he hopes it'll help people going through the same thing he did.

“I just feel like musically, I almost needed to get this song off my chest,” he said. “People say writing is a part of therapy and in a way, I feel like I’d been avoiding writing this song because I knew I only had one chance to get it right. I don’t mean to be too soppy about it, but if 'Two of Us' can help just one other person who's going through the tough time that I went through, then that would make me really happy.”

"So I will keep you, day and night, here until the day I die/ I'll be living one life for the two of us/ I will be the best of me, always keep you next to me/ I'll be living one life for the two of us/ Even when I'm on my own, I know I won't be alone/ Tattooed on my heart are the words of your favorite song/ I know you'll be looking down, swear I'm gonna make you proud/ I'll be living one life for the two of us," Tomlinson sings.

Check out the handwritten lyric video for "Two of Us" below:

Following the song's release, the hashtag #TwoOfUs started trending with fans flocking to Twitter to show the 27-year-old support, as well as praise him for being so open and honest about his grief.