Your H is justifying why he walked out on you and nothing more. If he said he loved you he wouldn't be able to leave. He has to make his life with you worse than OW otherwise no point in leaving.
At the moment OW will be giving him something he feels he is missing from his life. She is only a symptom and you should treat her like that. Don't even think about her as this gives her power and she's not worth it.
Stand back and let the relationship run its course into a brick wall and it will. But your H needs time and space to move ahead in the tunnel.
I agree with Jack. Block his text until he can remember not to send the 'accidental' texts to you. I personally think he is trying to get you to react which again justifies him leaving you. All part of the aliens game.
