How do I build up a wall in my heart against getting hurt in a friendship, when a colleague doesn't want to have the same intensity of friendship as I do. I normally don't let anyone get close to me, but if there's someone who I connect with I can't help but feel like I've been best friends with them for years and the friendship isn't reciprocated in the same way. The other person is more polite than wanting to build a close friendship. I don't know how to pull my friendship and heart back. Can anyone give me advice plz x