Should I add him on Facebook or instagram?

A year ago, a woman who is my grandmother's cousin tried to introduce her youngest son to me. She showed me his photo, and I actually thought he was my type. I didn’t get to see him that day. But another day, my uncle went to their house, and he was there. My grandmother's cousin told my uncle, "I wish your niece and my son could be together or at least meet." After that, she added me on social media. A year later, his uncle, who is my grandmother's cousin, passed away, and we went to his funeral. I was with my grandpa, and he came up to us and said hi to my grandpa. The atmosphere was really strange; I didn’t say hi to him, and he didn’t say hi to me. Then we all went to a relative's house, and everything was okay; he was in one living room, and I was in another. When it was time to go home, he said goodbye to me. That’s all. But I could see his family and relatives looking at us when we said goodbye; especially his dad was smiling. After that, one of his brothers added me on Facebook. I don’t know what to do, and I don’t know what he’s thinking. Should I just add him on Facebook? What do you think I should do?

Should I add him on Facebook or instagram?
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