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There is nothing fundamentally good about love. It is a completely selfish emotion, a form of desire. If the character you are writing is evil, then he would act on this desire in evil ways. He may...
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Source: https://writers.stackexchange.com/a/45434 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
There is nothing fundamentally good about love. It is a completely selfish emotion, a form of desire. If the character you are writing is evil, then he would act on this desire in evil ways. He may for instance just kidnap his target and use psychological tricks until they love them back. Or maybe set up a fake kidnapping, and then come to the rescue, there are many ways to go with this, but you get the idea. If nothing else look at comic book Thanos who tries to murder half the universe to impress his crush. There is a chance that this love story is a redemption arc. In this case your character would soften up as he peruses his love interest. Maybe he would try to make himself a better person to be more likeable. I think the important thing is to understand which of these two ways you would like to take the story, and steer in that direction.