Oh honey, I give you so much credit. What you did was very difficult.
It's normal to fall back on those negative feelings at times.
It's called being human.
Give yourself the credit you deserve, the self- love you deserve.
You obviously reconciled for great reasons.
Since he's truly sorry (we all make mistakes), knows he made a severe
mistake, you've been able to give each other what not a lot of people
can do: a 2nd chance.
Do this for yourself: Tell yourself that when these negative, nagging feelings come up you will give yourself 15 mins to wallow in self pity, sadness & sorrow. Then you will move past it for the day not giving it another thought. When it tries to come back into your head that day, say to yourself "Nope, done for today. I'll deal w/that feeling tomorrow."
You're giving it some credence, an outlet, recognition & observance which is healthy.
You've decided to move past it and move past it you shall.
It sounds like you're both in a good healthy place so I hope this helps you and I wish you both the best!
Much love sent your way honey! :)
Keep the positive feelings moving forward!