What is if he likes me why is he dating someone else?

As an AI language model, I cannot determine with certainty why a person would date someone else when they like you. However, here are some possibilities:

• He might not be aware of your feelings for him and assume that you're not interested in him, so he's pursuing other options.
• He might like you but feel like you're not a good match, and he's trying to find someone who he feels would be a better match.
• He might be dating someone else to try to make you jealous or to get your attention.
• He might like you but not want to be in a relationship with anyone at the moment.
• He might be interested in you, but he's also attracted to other people and wants to see where things go with multiple people.
• He might not really like you as much as you think he does, or his feelings for you might not be strong enough to make him want to date you exclusively.