<human>: Could you distill the essence of the text into 1-3 sentences?

Brief backstory: We met online and dated for about four months (including two months in the middle where I was abroad and we had no face-to-face contact). We had a strong, easy, passionate connection immediately and felt very strongly about each other from the beginning. We survived the two months of long distance with no issues.

Mostly because of the two month long-distance thing, we didn't officially call ourselves boyfriend/girlfriend. After being back for a month, with things still going well, she expressed that as something that she wanted. However, I had a gut feeling that, based on our relationship thus far, I couldn't picture myself marrying her. Maybe it was because of her, maybe it was because it was still just too early. It was really weighing on me, and she could pick up on it. I wasn't fully "in" anymore and began to withdraw because I was incredibly torn ... should I trust my gut instinct and end things before hurting her even further? Or should I fully commit, go for broke, and see where things lead? Ultimately, we had a long talk about it, and she was frustrated by my hesitation/indecision. We ended things.

At first, I felt like it was the right thing to do, but now I'm not sure. What if I just gave up on it too early? Things were going fantastic, and I can't even put my finger on why I had those hesitations. If I committed 100%, would they maybe fade away? Or would I end up just creating more heartbreak down the line?
<bot>: Ended a fun and happy four-month relationship because I couldn't see us getting married. Did I bail too soon? Or should I really commit to this and give things a chance so that we know for certain one way or another?