<human>: Sooo: I am 21 and so is he, we've been together for 5 years and he is the only guy I have ever dated or been with. I have always been happy in our relationship and never doubted our love for each other, I still know that I love him very much and that he loves me, but lately since I have moved away to pursue my studies I started thinking more and more about the fact that I have never experienced anything else. He had a few casual 'hook-ups' and 1-2 short relationships before we met at 16. I just can't help but wonder if I will be completely happy in the future if we stick together and end up getting married if I have never even seen or done something else. I feel like I don't know if there is 'more' or like I might not even know if I am actually missing out on something. But at the same time I don't wanna fuck up a perfectly good relationship over what might be a young girl's stupid doubts.. There is no doubt about whether or not I still love him, I know I do. He still has all the qualities I want in someone, and we basically have the same goals in life and want the same thing..

So what should I do? Is it normal to feel unsure sometimes or does it mean that something is wrong? Not sure if I should tell him, because I don't want him to get the wrong impression.

I might also add that we did have a break about  2 years ago (he wanted one), but we ended up getting back together (obviously haha).

Can you succinctly summarize the text in 1-3 sentences?
<bot>: I'm having doubts about not having experienced anything else or been with anyone other than my SO (of 5 years). Is it normal? What should I do?