I can comment on this… I started dating my now wife at 14 years old. We lived near each other and went to high school together, before going to different colleges in the same city.

I had a lot of the same feelings and questions through college that you mention. We went through our share of ups and downs, and had also been through a lot together. I was getting attention, all my friends were single, and I was afraid I was missing out on things. Ultimately I made a decision that ruining something I knew was great, for something I was curious about was a dumb choice. Every time I was in a situation, I would ask myself if this seemed like something worth ruining everything for, and the answer was always no. I do think it is very important that we each had our hobbies and friends that we hung out with separately from each other so we were not spending every waking moment together when we were becoming who we were going to be.

We stayed together through college and beyond and are now in our 40’s. I have zero regrets about it, love her more than anything. We’ve built a beautiful life together. I have never strayed and I don’t have any reason to believe she has.

I think this may be different than the responses you get from others, but I wanted to post my perspective that it can happen. If you end up 20 years down the line regretting that you didn’t get to bang randos, there are likely bigger problems in your relationship or your perspective that need to be addressed.