Open relationships?!

Here’s my dilemma. I’m 19 and I love my boyfriend to death. He is so good to me and he lives to make me happy just as I do for him. I started uni this year and we’ve been doing long distance (until now coz of covid). I’m about to back to uni halls and do long distance again and I have a lot on my mind. I am so happy with my boyfriend and the last thing I want is to break up because he is my best friend and he is my constant ❤️ BUT I also worry that I am missing out on the uni experience, that I’ll look back and regret not making all those memories. I think it’s only human to want to experiment during these times! The solution I have (and I know it’s childish) is to have a SLIGHTLY open relationship where we could hook up with other people and flirt with them but no sex. I feel like then I can have the best of both worlds and so can he (he’s just about to start uni). Is that selfish? I just feel we’re so young and that this would be okay. Thing is I don’t know how he’d feel about it. I’m not sure if it would go against his morals. Should I just forget about it or talk about it with him? Is it too much to ask of him? I’m someone who really likes to get things off their chest. And I just want to clarify - this is NOT a question of our relationship because I couldn’t be happier. Opinions please!