I really doubt it - at best he might have loved her in a way you love your favourite tool. Great Dark and Light Ones have plans within plans and are not afraid to sacrifice their peers for own gain. Alisa is one such case:
The whole action of the Night Watch novel revolves around Svetlana's rise to power as a Great Light Enchantress and about Day Watch trying to prevent it. When the gambit with vampiress hunting for Egor and Svetlana's self-cast curse doesn't work, Zabulon starts his "Plan B":
He knows that Anton will be opposing Gesar's plan to use Svetlana as a "general in the war against Darkness" (because this would make the Anton-Svetlana relationship impossible), so he picks Alisa, and as the proof of his love, he gives her a powerful artifact allowing to steal life (and power) from unwilling victims. Now, after giving Anton a big speech about the dangers of the Chalk of Destiny, Zabulon puts Alisa in Anton's way, knowing that she won't be able to resist using the artifact and, in effect, getting arrested. And here is the little masterpiece:
- If Alisa wouldn't believe that Zabulon loves her, she wouldn't call him.
- If Anton wouldn't believe that Zabulon loves Alisa, he wouldn't accept the deal, to let the girl go in exchange for allowance to perform a powerful magical act (he well remembers the problems his last deal with Dark has caused).
- This permission allows Anton to gather enough power to temporarily rival even Gesar and stop the Light plan to use Svetlana with the Chalk.
'I confirm the pledge made by Alisa.'
He seemed to be utterly serious. I swallowed. A promise like that from the head of the Day Watch . . .
'Never trust the Dark Ones.'
'Any intervention up to and including the second degree.'
'Are you that eager to avoid a scandal?' I asked. 'Or do you need her for something?'
A tremor ran across Zabulon's face.
'I need her. I love her.'
'I don't believe you.'
'As the head of the Moscow Day Watch I ask you, watchman Anton, to settle this matter amicably. It is possible, since my ward Alisa Donnikova had not yet caused any significant harm to humans. As compensation for her attempt' – Zabulon emphasised the last word – 'to perform a magical intervention of the third degree, the Day Watch will accept any Light intervention that you may perform up to and including the second degree. I do not ask for this agreement to remain secret. I do not impose any restrictions on your actions. I confirm that for the offence she has committed Day Watch agent Alisa will be severely punished.
And the right to carry out a second-degree intervention that Zabulon had granted me so generously was a trap. There wasn't any doubt about that. He'd framed his own girlfriend, drawn the lines of probability together so that we'd meet and then handed me his deadly gift with a mournful expression on his face. I couldn't see far enough into the future to be sure the Good I did would never become Evil.
And when Anton starts to use his gathered power:
'Don't do that!' Gesar shouted. 'Don't you dare!'
In one swift movement he dashed across to shield Svetlana and Egor from me. As if that could stop the spell. There was nothing that could stop it now. [..]
Zabulon laughed quietly behind my back. [...]
smiled at Svetlana. And very slowly raised my palms with their fountain of rainbow light towards my own face.
Zabulon's howl didn't cut through the roar of the hurricane, it completely drowned it. A bolt of lightning flashed across the sky. The leader of the Dark Ones rushed towards me, but Gesar stepped out to meet him, and the Dark Magician stopped.
Immediately after this gambit, Alisa is discarded as a love interest: Zabulon who was lovingly touching Alisa's hair in front of Anton just to drag her brutally moments later) - that is until Zabulon needs her again, this time to remove Igor, who would guarantee that Nadya, a future Absolute Level Sorceress, would join the cause of Light. So Zabulon again uses Alisa: he gets her exhausted in a meaningless battle, feigns the love again, sends her to recover and meet Igor, who believing that Alisa was using him kills her in a duel and later commits suicide out of guilt.
Zabulon was "in love" with Alisa when it was necessary for his plans, discarding her when she wasn't needed.