Is divorce worth it, even when life is comfortable for our child?

I’m 30 (f) and have been separated for 2 years living under the same roof with legal spouse, 38 (m). We are separated due to him online cheating in our marriage, which he has done once before when we first started dating a year in. Unfortunately at the time this first happened I was 19 and stayed not knowing any better. Now I am 30 and we have a 3 1/2 year old together. Right now on paper life is comfortable we make close to $200k together, our daughter is happy, and there is no tension or fighting and we all get along. I’ve lived in an apartment for 4 months last year trying to make that jump but had such a traumatic experience with my job and had no family and friends around and so he was the only one around to be supportive and so I moved back in thinking maybe it could work. But now that I’m here I’m getting that nagging feeling that I truly don’t romantically want to be with this person due to lack of chemistry and cheating but I also don’t want to make life harder on my child who is an only. I’m stuck at a crossroads.