Do you think I should talk to my ex bf?

[Sara]

I used to date a guy when I was only 15 years old, he was a year older but we had a nice solid relationship. He was so consistent with me and we hardly ever argued, even if the arguments was because of me.. He would literally go out his way to apologise to make things right. We both moved cities and we parted ways. Long story short I said some nasty things to him and he deleted me off Facebook back when I was 16. After 3 years he adds me back on instagram and I really don't understand why? He isn't talking to me or anything, he's only liking my pictures and it's really giving me mixed signals. I don't know what to do, do you think I should add him on Facebook again and talk to him as a friend first? Because I really have old feelings for this kid 😭😫!!!