The why is likely the same reason why other people do it, and why people are connecting with AI. It's simply easier and more appealing to connect with someone new than to work through the issues that caused you to get in this point in the first place.
I went through a rough patch in my marriage and we distanced ourselves from each other. It took months for us to actually sit down and have the tough discussion that we needed to have, and to get down to the root of the issues. Ours had to do with the fact that in 5 years and 4 months we brought 4 little people into the world, and we were neglecting each other to take care of them. All that time wasted, and discussing divorce, because we couldn't just sit down and openly talk about things. It was definitely easier to pull away, but definitely better to reinvest in the marriage.
I suppose the first step is to figure out what you want. Once you know that, you will know which direction to work in. You just can't half-ass it either way as each moment wasted is one you won't get back.