Enjoy this time, it usually doesn't last long... I say this from years of being on SI, and from personal experience. I call it the "honeymoon phase". It's where the BS is still rationalizing the infidelity (it was just a mistake, he's perfect now, look how much more he's plugged into our family, it won't ever happen again) and dreaming that this bliss can last forever. Unfortunately, those thoughts are not reality and there is often much more doom and gloom to come before things truly get to a place where the BS can have real, honest, deep trust in the WS and where the WS actually DESERVES that trust.
I was that was as well at 3 months out. Thought we were going to be the rockstar couple who fully healed in like 6 months flat. We were graduated from MC before we hit 4 months even. Then there was TT, then the anger really set in (and I thought DDay was full of anger, HA!), then the antiversary was near, and on and on. I was so set on being a rockstar, that I tried to jump past some of the phases, and I had to admit to myself that there was no jumping allowed in true healing. It was a sad day for me to realize that and admit it.
I don't say these things to discourage you, only to set up real expectations and to let you know, ahead of time, that it's ok if you're not the rockstar BS that you want to be. It doesn't mean you're a failure, it doesn't mean your R is fake or worthless or doomed... it simply means you are just as human as we all are and you process the healing the same way as most of us do.
Enjoy the feelings you have now, but brace yourself for the downward ride on the coaster.