Zeheart is a new muse, so I only have one bit of headcanon. It also contains SPOILERS.
Later in the series, Ezelcant convinces Zeheart to take over Project Eden and his true goals. It's not written very well, and has taken a lot of flak from fans for not making a whole lot of sense. My headcanon is that Ezelcant revealing his true goals broke Zeheart inside. With his faith in his ideals shattered, he attached himself to the only person reaching out to him -- which happened to be, once again, Ezelcant.
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Later in the series, Ezelcant convinces Zeheart to take over Project Eden and his true goals. It's not written very well, and has taken a lot of flak from fans for not making a whole lot of sense. My headcanon is that Ezelcant revealing his true goals broke Zeheart inside. With his faith in his ideals shattered, he attached himself to the only person reaching out to him -- which happened to be, once again, Ezelcant.