Joe Jonas' forthcoming solo effort 'FastLife' is dance oriented and urban, earning the singer comparisons to Justin Timberlake, which he touches on in a recent chat with Digital Spy. However, the most interesting thing that JJ reveals is that while 'FastLife' has fun songs that you can listen to while hanging with your bros, the album does contain a song called 'I'm Sorry' -- and it's about one of Jonas' many high-profile relationships.

In Jonas' past, he's squired Taylor Swift, Demi Lovato, Camilla Belle and Ashley Greene, just in case you haven't been keeping up with the singer's date card, which is littered with stunning women.

"There's a song called 'I'm Sorry' and a song called 'FastLife' that I'm excited for people to hear," the newly-solo singer said. "'I'm Sorry' is one of those really honest songs about ending a relationship too early and you want them back in your life and all you can do is apologize."

He contends that the song 'FastLife' is just about going out with your friends and having a good time. "I think it's one of those songs that people can relate with and like," the middle Jonas said.

Jonas admits that he also wrote "a happy song about someone but then we ended up splitting up, but you have to put those kind of things to the back of your mind and tell yourself that it's a good song and it works on the album."

The singer wasn't nervous about laying his relationship cards face up on the table for 'FastLife,' however. "I wanted to be honest, and when you do that you have to go there for certain good or bad reasons," he said. "It can be difficult to go ''Here's my heart on a platter,' but at the same time you've just got to go for it."

That's a brave decision and one he hopes fans will relate to. "I have grown up and so have my fans," he acknowledged. "They'll be going through relationships that are more mature and hopefully they'll understand what I'm speaking about."

Let's break down Jonas' comments about his music and his bevy of exes and infer who he might be referring to, shall we? Jonas revealed that  'I'm Sorry' is about one of his relationships that ended too soon. We guess he is referring to Demi Lovato here, since they dated a very brief time last year, though his relationship with Swift, while much buzzed about, was also short. She has written songs about him, and it's obvious things did not end well between them, so perhaps this is a sonic olive branch that he is extending to her?

And that happy song he wrote? We think that one has to be about 'Twilight' star Greene, since they were together for over a year and presumably while he was writing music for 'FastLife.' They split in March, before the Details story landed, where Jonas gushed about what a dedicated girlfriend Greene was.

As for those JT comparisons? Jonas is just fine with them, and he should be. "I think it's flattering," he said. "He's a fantastic artist. At the same time I feel like Justin Timberlake has his own lane and I'm trying to make something that is different and personal and not like anything else. Of course, it's still a very big compliment."

Joe Jonas' 'FastLife' drops on October 11.