A few thoughts about your posts.
Hysterical bonding is common in the early months, hitting some harder than others. It has both benefits and drawbacks. It can reaffirm and strengthen your bonds with each other. It can also be used as "love-bombing" by a WS as a tool of manipulation.
Regarding hand holding, hugs and other displays of affection, be honest with yourself about what you're comfortable with and want. Don't force or over think it.
You mentioned being "nasty" with her, which is rare for you. Brother, I experienced rage like I'd never known. The lashings I gave my now ex-wife are truly regrettable.
Anger is a perfectly natural response to betrayal. If and when you do find yourself feeling rage, do yourself, and your WW, a solid by immediately disengaging. There were times when I'd simply walk away. I'd go for a long walk or bike ride (no vehicles, alcohol or drugs). I needed time to cool off and think things through.
You mentioned being cheated on before. Same here. My HS girlfriend cheated on me with one of my best friends. I swore then that I would never, ever tolerate that shit again. And yet, we stayed together for about six years before I finally gave up. My son was only 4yo on d-day, which is a huge reason why I gave reconciliation a chance.
Wayward spouses often try to shift at least some of the blame onto their betrayed spouses (mine could have won a frickin' gold medal). You mentioned she agreed to stop trying to blame you and/or the marriage, which is a good thing. However, you also mentioned she was considering leaving before the affair started, which indicates that she was already half way out the door. Same here. My ex told me she was considering a trial separation months before. It took me years to figure out she had her fling as an "exit affair."
When you have your initial consultation with a therapist, IC or whatever, ask them about their personal and professional experience with infidelity. Far too many ICs are clueless. Remember, you are hiring them. Make sure they're qualified.
Lastly, have an exit plan in place. Consult a lawyer or two. Educate yourself on your legal rights. If you have a regular PCP, let him know what's going on in your life. Chances are, especially if he's older, he's heard it all before.