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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.
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Trying to forget is also being involved with the person. So you will not forget. Best way to forget it not try to remember or not to forget. If you hear something about the person or place analyse the feeling that arising and do not be averse or attached to them.
You could try reading:
But best is to get a competent meditation teacher or take a Vipassana course.
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You could watch the feeling arising, staying and changing and then fading away. Seeing its impermanence will make it more bareable for you.
Also see its conditioned nature. Feeling is conditioned by contact. It can not arise without contact. In your case seeing a bilboard triggers a memory which is manifested as a thought. When mind is contacted by a thought a feeling arises.
All this is to diminish the resitance toward that feeling. Just let it arise and pass away, don't get involved with it.
Hope this helps
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How about just accepting that the emotions are there? Sometimes fighting, struggling are the things that intensify emotions. Unfortunately emotions can't be erased, we can only try to observe them when they arise and acknowledge them as they are. Maybe accepting that these feelings toward this person may stay forever. Will it be that bad?
Have you tried writing a private journal? I've found that very therapeutic for letting out stuck emotions.
Good luck!