Can you truly be friends with an ex?

Now listen, we never officially dated. In the end I didn’t realize they had feelings for me but I needed a lot of work (therapy).

Now they are gone and I consider myself friends with the new person they are with and him.
Is it weird?
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Thank you for your input because sometimes we can be in our heads about a lot of things. I understand is best to have boundaries and certain things are not acceptable, but genuinely walking away from someone and also be on the same page with them. No animosity I can be cordial in a situation and that’s how it should be. I don’t wish no ill willand I’m going to be a friend I whatever I’m not trying to be in the way. I’m at peace with the situation.
Can you truly be friends with an ex?
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