Does it ever get better?

I found out my fiance cheated on me two months before our wedding. He attributed it to his porn addiction but it was not only that. He reached out to some random girl he gave an uber ride to and had a conversation with for 15 minutes. Yes he watches porn but he also reached out to a random woman for what I’m assuming is sexual favors. He’s getting therapy now and he feels very ashamed and even enrolled us into marriage counseling. I found out about this a week ago and still have to go through with our wedding due to family pressures. I just feel so trapped and feel like I have no way out. I relied on our future so much and I didn’t think that this would ever happen. I feel blindsided and hurt and don’t think I can carry on. Does this feeling ever go away??