<human>: Summarize the given text in a few sentences.

My ex and I were in a serious relationship in college (promise rings were involved), but broke-up due to a disagreement regarding "partying." His family worked in conjunction with the FBI. He regarded my partying as unacceptable in the relationship for this reason. 

Due to multiple stresses in his life and mine, we broke up. I was extremely close to his family before the break-up. Afterwards, he blocked me on Facebook, and also told his family to do so as well. After 8 years, he has now added me on LinkedIn/ETSY and unblocked me on Facebook. His sister recently added me on Instagram. (Their accounts were well established, and therefore not using email contacts to find potential new friends after just signing up for an account.) 

He is/was a terrible grudge holder and am extremely surprised that he's even reached out or allowed his sister to as well. Our mutual friends have told me he isn't in a relationship. Should I try contacting him? 

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<bot>: Serious relationship ended, and all contact cut off. 8 years later, ex and his sister are reaching out via social media friend adds. Neither of us in a relationship currently. Should I try contacting him?