Someone who persistently overlooks your feelings or your sentiments. For example, if you show your love by all means and they appear to not care and take you as a joke.
What such person can be called ?
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You call that person "a cold-hearted person" as it means:
Without sympathy, feeling or compassion; callous or heartless. [Wiktionary]
Or you can call him "an unfeeling person":
Without emotion or sympathy. [Wiktionary]
Or you can call him "a self-centered person" or "a selfish person":
Of a person, egotistically obsessed with himself or herself. [Wiktionary]
Yes, he is a jerk as Ricky posted in his answer.
A person with unlikable or obnoxious qualities and behavior, typically mean, self-centered or disagreeable. [Wiktionary]
cynical is what I would call such a person.
• of or relating to the belief that human actions are motivated only or primarily by base desires or selfishness.
• skeptical of the integrity, sincerity, or motives of others.
• bitterly or jadedly distrustful or contemptuous; mocking.