<P> In season one, Tim is shown being unable to cope with his best friend, star quarterback Jason Street's, accident, blaming himself for not being there to block the hit that Jason takes . At the start of the series he is dating Tyra Collette, though they both repeatedly cheat on one another . After Tyra breaks up with him, he begins sleeping with his best friend's girlfriend, Lyla Garrity . After Lyla calls off their affair, Tim goes on to stand by her and encourage her to stay with cheerleading even after their relationship is discovered and she becomes a social outcast . In the back half of season one, Tim becomes close to his neighbour, Jackie, and her young son, Bo . The two have an affair, but she eventually breaks up with him as he is much younger than she is . </P> <P> Billy begins to take Tim seriously as a football player in season one, talking to coach Taylor about a potential scholarship for Tim . </P> <P> Tim also reunites with his absentee father this season, tracking him down after receiving a traffic ticket that may result in the loss of his license without a parent's signature . He learns that his alcoholic father is now sober . </P> <P> In season two, Tim discovers that Jackie and his older brother, Billy, are in a serious relationship . He then travels to Mexico with Jason to support him while he undergoes an experimental surgery involving shark's blood and stem cells . After learning that Jason could die on the operating table he enlists the help of their ex-girlfriend, Lyla, and the two convince Jason to give up on the procedure . </P>

When does tim riggins move in with coach taylor