Consider that in your calculations.
In wondering whether you like someone or not, perhaps you can consider the decisions you've been making lately.
If he or she is a factor, then you might like that person. If not, then you don't.
Then, when you've made the decision, think whether or not you had ignored that person as factor.
If it was a decision you could live with and that person isn't part of it, then you might not have liked him all that much. If he or she was a part of it, then you might actually be in love.