Is it really make or break?

Always knew I was on the small side but my wife always helped me saying nothing wrong, now we have kids and it’s not as important sex, she has lost interest and I found her looking up porn with big dicks online, how do I approach this? Does she want a free pass or does she Wana Cheat, she isn’t the confident type but surely she won’t ruin our marriage over penis size, is she really that need of