Glad to hear you got your growth spurt and it sounds like you probably have a 32 inch waist. Start changing things around and see if she notices. More muscle, different clothes, start keeping a more erratic and slightly mysterious schedule to the extent you can manage it without neglecting the kids. Later on, you can restart the touching and texting, but for now start hitting the weights.
It only takes about an hour a week, three 20 minute sessions. Pick five of deadlift, squat/leg press, overhead press, weighted chins, weighted dips, decline or incline chest press (not both in same workout), pullover machine or pulldown, barbell row. These moves will make a big difference in a short period of time.
Regarding electronic commo in her potential EA, it's not necessary. Neither my wife nor my XGF had a cell phone, computer, etc back in the stone age. You might want to VAR her car and see if she's chatting on her commute.
I assume you've read Married Man Sex Life
, which is actually about how to maintain attraction over a long term relationship (AKA "LTR game").