<P> In "The Return of the Ring", Bart drops the bombshell that he will be returning to Bass Industries as "the only Bass in Bass Industries", pushing Chuck out of the company . Bart tells Chuck that the most he did was' redecorate' and give everything up for Blair . After this, Blair declares her love for Chuck, admitting she finally really wants them to be together . Chuck rejects her in anger, shadowing the words she once said to him: "I don't want to be Mr. Blair Waldorf ." </P> <P> Chuck pairs up with an unlikely partner--Jack--to take down his father . They meet in a casino in Monte Carlo . Blair turns up, informed by Jack of Chuck's whereabouts . Blair reveals she is' all in' and one hundred per cent ready to be with him . His decision on the matter is thus far unknown . </P> <P> At the beginning of the season Chuck and Blair make a pact not to be together until Blair succeeds at Waldorf designs and Chuck takes down Bart . After many failed attempts of taking down Bart, Bart and Chuck end up in a fight . This leads to Bart falling off a building and dying . Blair is the only witness to this event and so Chuck and Blair get married so Blair does not have to testify against Chuck . </P> <P> In the 5 - year flash forward, Chuck and Blair are happily married with a son (Henry). They are all gathered at the Bass house for Dan and Serena's wedding . </P>

Who tried to kill bart bass in gossip girl