Hi Brianne, I know this is an older thread from your journey, but I wanted to tell you of my similar experience.
I was married for about 25 years when the internet became so available and interesting. There was suddenly so much more opportunity to effortlessly connect with people.
I was on one board and there I "met" quite a few men with whom I connected. After feeling misunderstood, frustrated and disrespected in my marriage, the attention from others felt so great. They reminded me of my value and attractiveness, sense of humor and so many other things. It was enlightening. I'd been settling for less than I deserved with my husband for so long. We'd done lots of couples counseling but we kept hitting a brick wall. Even our therapist threw up her hands at his resistance.
So, online, one guy in particular, and I, really hit it off. He lived 1000 miles away in Colorado. I live in Massachusetts. I fell hard for him and couldn't get enough of our chat. And we had cybersex. After about 6 months of knowing him, and 3 months of a romantic cyber relationship, I was ready to go visit him. (My husband and I had opened and then reclosed our marriage some years prior, but I wanted to renegotiate things.)
However, when I proposed meeting, that is when my online bf bailed on me. He didn't want a real relationship, and in fact started dating a couple local women. He told me he was only attracted to thin women and I wasn't "his type" after all, since I am curvy. It broke my heart.
But I didn't regret having spent so much time talking to him (and to a lesser extent, a few other nice men). It opened my eyes to what I was missing out on in my marriage. I was not happy with my husband, but kept things going out of a sense of loyalty, stubbornness, duty and responsibility, house, kids. I figured that was just "what you do."
I tried many things for a couple more years to try and fix my marriage but it was just no use. I realised I was throwing good money after bad, so to speak. So we split. I am so glad! I am much happier now.
tl/dr version: An online relationship didn't work out for me the way I wished, but it opened my eyes to important things I was missing in my marriage, and would never get. This experience and the knowledge I gained ultimately led to a much happier life for me.