Sometimes we can learn to be happy just having them in our lives, and sometimes we have no choice but to distance ourselves from the person to protect ourselves. The hard part is knowing you love someone you can never actualize a relationship with, and the only thing you really can do is ask yourself if that is something you can cope with while still remaining friends with the other person.
It's impossible to unlove someone once you do, but trying to pursue it will only cause hardship and heartbreak if their sexual orientation doesn't match up with your gender.
