Staying friends after breaking up?

So my ex and I broke up 3 months ago and decided to stay friends he’s in a different country now and he still checks up on me every other week, I want to reach out as much as he does but every time I do, I blank on what to say, I don’t really know why. How can I get over that? I always think to myself ‘How can I start a conversation with him?’ Even though I do wanna check up on him and see if he’s okay, but I end up overthinking the situation and just end up not texting, what should I do?
Staying friends after breaking up?
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