I started a conversation with someone. after I deleted the "let's talk" post, I can't see the conversation anymore
Its me Lego.
Start one with me and do the same thing and we'll see if I can see it. Probably not, but let's test.
For those interested, a "conversation" is essentially a forum thread that is only visible to you and whomever you invite to the view it. If the first post in a thread is deleted, the whole thread is deleted. So... don't delete that first post!