Hi Jane I agree I don't think it is too late at all.
Even if you just go to your parents or a friends house on an evening or go for a drive walk. Anything so you don't have to spend time with him, and hear his phone binging will make him wonder. If he asks where you are going just say out, be pleasant but don't give details. He wants to live separate lives so you go and do the same.
Not sure if you have DR book but I find that one really good.
Stay strong SJ
Me 46 H 39 M 11 T 14 S 10 DO 8 ILYBNILWY 11.06.17 Separate rooms 11.06.17 ILW OW A ongoing 12.06.17 Kicked H out 23.6.17 H came home 20.8.17