This much drama this soon in?
Nah, sack it off.
And accidental texts are fairly rarely accidental in reality.
And if they are accidental they are usually boring and genuinely for another person, or about you to another person so they sent to you because you were front of mind.
Like I said this early on you shouldn't have to be worrying about "crazy" ex (take that with a pinch of salt!) or that his house is a bachelor pad (he is one!).
Even if his story is true (spoiler alert - I don't think it is) then do you really want to get caught up in this melodrama?
This soon in things should be nice and easy and stress free. They sound full of drama and games and
Look forward to meeting someone you have fun with and laugh with don't waste time with someone already being a headfuck for you!
Oh and you said:
i genuinely think she sent the message in error as if she wanted to cause trouble she would have used a number that wasn't her own.
It's caused so much trouble that you're stressed and starting threads on the internet about it and he is supposedly a text or call away from contacting the police about her but has also been in touch with her to "warn her off" so they've spoken again. I'd say she's got exactly what she wanted for the princely sum of one consonant please Carole!
My love read back through your posts on here and see how many self reassuring measures you're putting in place this early on: he copied me in, he showed me the messages, he told me he'd warned her off, he's blocked her on Facebook etc - none of this means anything if you feel uncomfortable.
You said this is your first dating and relationship experience - please don't let it be one where you're blind to red flags and get drawn into melodrama and anxiety.
I promise you that it shouldn't be this hard and you can have so much fun without all the drama with someone else 