Should I smile at my ex boyfriend and say hi to him again when I see him?

Peaches306
OK it has been three months since we broke up and we never talked since and it was painful knowing he won't talk to me. but out of the blue surprisingly he started to joke around with me today with a big smile on his face. we never had a deep conversation but he would poke jokes at me, like for example he would playfully grab my books and hide them as a joke, he would playfully shove me and smile, it was just out of the blue, he was just joking around, and since he joked around with me today so would it be safe to give him a smile and say a simple "hi how are u?" and start a simple friendship? is his action today of joking around with me a sign that its OK to talk to him again?
Should I smile at my ex boyfriend and say hi to him again when I see him?
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