Can I move on from my ex when he is my best friend now?

Hello guys, my ex and I kept in contact after the break-up and still hangout from time to time. We were together for nearly 4 years and were best friends and it just didn’t make sense not to stay in contact. He broke up with me some months back and now he wants to work things out with me. There was a lot of drama in our relationship and I wouldn’t want that again.
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Times Reporter