I am further along this process than you. I know my H never actually left, but he did have the A for 18 months and it wasn't good. The healing process goes in cycles from what I have experienced and what I have seen from others. Even to the extent when we wonder sometimes if we should have fought so hard. That's quite normal. Ride out the storm and hang in there. It will get better.
Dates that have stuck in your mind will hurt....and the anniversary of them may hurt for some time. Last time my H was away with OW was on my youngest D's birthday. Birthdays have always been such special occasions in our house and I was pissed enough that H was away on 'business'. To think he was doing what else he was doing drives me insane. Even now, years down the line, when my D gets excited about her birthday and talks about what she wants, I just feel sick.
You have to just weigh up whether it is worth the hurt. I think it is, and I think you do too; it WILL get better. There is always a honeymoon period when you first get back together....and then there is the slog of really mending what was broken. As long as you know why it fell apart - and that you are in a different place now and can cope with the important issues - you will be fine.
((((HUGS))))) for this hard anniversary of bad memories. Write down your bad thoughts, stick them on a large firework rocket, and fire them into the sky, ( hoping the burnt out stick falls on Helen - lol).
Saffie me 46 H 46 M in 1986 D20,D18,S16,D13 H's A 01/05 to 07/06 H recommitted to M 07/06 renewed vows 09/06 Going from strength to strength