Should I write a thank you message/letter to my ex boyfriend?

We broke up 3 months ago. Now I realized I never said a thank you to him, and I want to tell him...
We only dated for a short period of time, but we were really good friends before dating.

Can I text him and tell him? Or is it too annoying/unnecessary?
Updates:
+1 y
We've become friends again and hung out once since the break up. I think the friendship is good and sincere.
We both know that we won't get back together, mainly because of the distance.
Should I write a thank you message/letter to my ex boyfriend?
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