Why did blink-182 break up?

During the self titled album blink was at the HEIGHT of their career, they sold out arena's across the world. But Tom just had his daughter Ava. He had been gone for about 2 years and missed pretty much the entire pregnancy, and the first year and a half of her life. So he just wanted to go home and be with his family. Mark and Travis thought that would be a terrible idea to take a break right now. This made Tom really upset and he told them he just couldn't keep going and HAD to go home, then they said if that was his decision he would have to live with the consequences and so he decided he couldn't do it anymore and left for good. Then he started AVA

If you want you can hear this story told by tom on their AVA - Start The Machine DVD

Answer

In 1998, midway through a U.S. tour, Drummer Travis Barker, who was touring with The Aquabats on the same tour with Blink-182, later played the set because Scott Raynor had to leave for the day. After the set, Mark Hoppus and Tom Delonge sat down and talked about Travis Barker joining the band. The next day he became a member of the band and replaced Raynor permanently. DeLonge left the group in early 2005, with the band portraying it as an "indefinite hiatus". DeLonge went on to play alternative rock in a band called Angels & Airwaves, while Hoppus and Barker continued in a similar genre with their band +44.

Tensions arose between Mark Hoppus, Travis Barker, and Tom Delonge because of DeLonge's desire for a half-year respite from touring to spend time with his family.

Also Hoppus' feelings of betrayal after the formation of Box Car Racer, (Delonge and Barker's experiment with record ideas they felt were not "Blink-friendly,") created further problems along with discussions regarding Blink-182's future recording endeavors.

After a cancelled tour of February 2005, the Blink-182's band manager called Hoppus and Barker to tell them that Tom had quit the band.

DeLonge confirmed that "Blink-182 was dead".