I cannot even guess whether your H is in an A or not. I can tell you from my own experience WW was constantly texting and not hiding it from me either. In fact she took a self with S13 right in front of me and text it to OM (I thought it was to a friend). She even told me who she was texting when I look back on it but said it was her yelling at them for not getting MIL's roof completed.

Questions:

Is this constant texting new?
Are there other changes in his personality?
You said most of his time is accounted for, what times are not?

Me 41
W 33
M 2013
Suspect A 11/15
Confirm A 1/16
She moved out 2/14/16
Stepson 13
Stepson 16