Bullshit. Scott seduced Emma.
Emma EXPLICITLY stated she started the affair to get back at Jean because Emma was still butt-hurt Phoenix Jean put her in a coma in her first appearance.
But she ended up falling in love with Scott, which fucked shit up.
Also, Scott only went with Emma after Jean's death, because Jean's future self saw that Scott would retire after her death and Beast would the world up under Sublime's influence and she had to go back in time to give Scott permission to fuck Emma. And even then, Emma had to basically shame Scott into staying with her as he tried to dump her after Jean's funeral