What Buddhist materials explain how to understand one's irrational feelings?
According to Buddhist dependent origination, depending on contact feeling arise, depending on feeling craving arise, depending on craving clinging arise, etc...

The feelings that arise is a result of past conditioning and when there is contact the past feeling that was conditioned arise, be that attachment, revulsion or neutral feeling. The practice to recondition how we look at a person, others and ourself included, is the 32 parts of the body practice of which the link is one example. 
Google for ways to practice the 32 parts of the body.