Chris Brown says Rihanna knows how sorry he is.

Chris Brown says Rihanna knows how sorry he isAdam Lambert may not be welcome on ABC, but the network welcomed Chris Brown Friday night on 20/20 to "come clean" about assaulting Rihanna in February.

Robin Roberts sat down with Brown, playing clips of her interview on the same program last month and a clip of Chris back in 2007 on The Tyra Banks Show.

During that clip, Brown spoke about the abuse his mother received at the hands of his stepfather, and professes how he doesn't want to do that to a woman.

Left in a daze by his own hypocrisy, Brown said: "I'm really sorry for what went down and what happened and by no means do I think that's acceptable."

That's really all he could or should say, really, as tries to not let one incident define his whole life. He also said he knows he let a lot of people down.

He did not comment on Tila Tequila's theory that Rihanna has herpes.Brown has completed the community service portion of his sentence (he pleaded guilty to felony assault) and is still undergoing domestic violence classes.

He is also on five years probation. As we've seen previously, Brown is certainly sticking to the "I was wrong" theme and not trying to make any excuses.

Some people might not ever accept his apology, or believe that he is really trying to be a better person, but he's trying. And he says Rihanna knows it.

When the subject of his new song "Changed Man" came up, Brown said he played it for Rihanna and that "she cried when she first heard the song."

He then says he "has love" for Rihanna but is not "in love" with her, and at this point in life, is just trying to focus on what he can do with his talent.