we learn through attachment that it is painful to be attached, that we don't own someone else or his/her feelings, and mostly that our happiness shouldn't rely exclusively on someone else's appreciation or feelings for us. The same goes for working with people who we don't appreciate. I believe we come across people who are difficult to be around because we need to learn something from them, even if the lesson is just "keep away from assholes". Loving someone who is wrong for us often teaches us that we are holding on to an illusion about that person – we might be over- emphasizing their qualities and missing their faults – or about ourselves – that we don't have much value outside of a relationship with the person we think is "the one". The wrong person is there to show you the only right person is actually you; you have to honor your place here and keep living the best you can even with an unrequited love..