Relationship problems. Girlfriend and I want to be together, but fear passing up opportunity of dating other?

My girlfriend and I have been dating for over 1 year. We’re only in year 4 at University but we’ve had very little experience with other people. Lately, the issue of other potential daters has come out and we’re both afraid to “not take advantage of our youth”. Our lack of experience is making this curiousity very tempting and confusing.
The answer should seem simple, move on and see what’s out there. There’s even people ready to date us.
However, every time we “split up or take a break”, we start missing eachother, have feelings of regret and get generally depressed. We’ve constantly spoken about how this seems so “forced” and “unatural”. But our lack of experience is making us also a bit too afraid of missing out on these opportunities. Even though our relationship has made us close. It’s very complicated.
But while, we are looking at good advice. I’m wondering if anyone can just show us their reasoning from a more experienced point of view. (we’re only 21-22).

Hi! I´m only 20 lol! but you know what? i´ve thought about that too…i have a boyfriend too. If you´ve alredy split and missed each other I think that you belong togheter!! But it could also be that you´re not in love, or feel that you can be with someone better…and that´s why you´re constantly trying to be appart.
Try to consider this point of view,ok?:
maybe you have already found your perfect match! and if it´s not …you will break up in the future, but if you feel that you´re in love and happy toghether…try to stay toghether!!

Nemi Love Storii-Episode 22