What are the pros and cons of reaching out to an ex?

Anonymous
I have been in no contact with my ex boyfriend for 7 months now and people are telling me that I should contact him because he has been staring and glancing at me, could this mean anything? The last time him and I were in contact, he told me not to contact him again, so I was forced to do no contact.
What are the pros and cons of reaching out to an ex?
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