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Most humans have a certain need for closeness. Likely you are either introverted or fairly isolated, you feel alone, so you feel much greater an urge to be close to someone. So what would be a simple attraction for someone else turns into love for you. Your mind subconsciously strives for that kind of attachment, it knows you need it, so it's going to get it at whatever cost, no matter the other person's feeling, your 'chances' and whatnot.
Basically, get some friends.