"Do you want to come over?" at half 12, I changed phones so just the number came up but I'm 90% sure of who it is.

I did have onenitis for this girl but i recently moved on, I texted back the morning after "who is this?" and got no reply, should I send a follow up text like "don't be shy" or just ignore it and if I happen to bump into her again I'll say hi and pretend to not know who it was?