In the 2008 miniseries X-Infernus, Pixie summons her Souldagger and stabs Kurt in the chest, knocking him out. When Pixie removes her Souldagger, Magik's Soulsword emerges from his chest.  Magik teleports away after taking out Pixie, Mercury, Rockslide, and Beast. Kurt wakes up and stops Pixie from going after her and Pixie breaks down and apologizes for stabbing him. Later the X-Men gather and Kurt is put in charge of a team of X-Men to go help save Magik.  Upon entering Limbo, Kurt, Mercury, Colossus, Rockslide, Pixie, and Wolverine fight their way through many demons. Pixie, Mercury, and Rockslide are horrified at how brutal the older X-Men are towards the demons. An octopus type creature attacks Kurt until Pixie jumps in and kills it with her Souldagger.  Hearing the screams from the castle, Kurt teleports the X-Men into the throne room. Once there, Witchfire turns Colossus and Wolverine against Mercury and Rockslide. Kurt notices Illyana chained to a pillar and she asks him to stab her with Pixie's Souldagger, as it's the only way and he is the only one to do it because he is attuned to magic.He apologizes and he stabs her; at that moment Colossus punches Kurt, and Witchfire finishes making her fifth and final Bloodstone from the now demonic Pixie.  The fact however that Colossus and Wolverine have not killed him, makes Kurt realize they are not fully under her control. Using Pixie's Dagger, Kurt then pulls Illyana's Soulsword from her, and uses it to free Wolverine and Colossus of Witchfire's control. Unfortunately, the demon manages to use the Bloodstones to summon the Elder Gods. Through their combined efforts, the X-Men and Magik managed to banish both Witchfire and the Elder Gods, but not without losing four of the five Bloodstones. Furious at losing another part of her soul, Pixie flees. Being told by Illyana to let her go, Kurt consoles Magik about the theology of a soul, before she teleports them back to Earth. Kurt, along with Colossus, Cyclops, and the former New Mutants team, convinces her to stay with them and join the X-Men.

Answer this question "DId he join?" by extracting the answer from the text above.
convinces her to stay with them and join the X-Men.