First of all, it is disrespectful. Want some first date conversation starters? Being emotionally ready to finally meet them in person should be your first concern. Read our first message article here. I do not continue to ask questions about his prior relationships unless HE volunteers further information.
But there should be zero expectations or assumptions made.
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It is shocking I have to say this, but from my experience, it needs to be said. Do not go on and on about your ex. They could even lead to a second date. See our best date ideas in LondonManchesterGlasgow and Edinburgh! Keeping it fun and light early on will allow you both to feel more comfortable. But merely spitting out facts makes for boring conversation.