Am i wrong if I want to explore?

So i have been in a relationship since past 8 years. Its been my only relationship and the guy is 5 years elder to me. We have had a lot of issues because i was very young when we entered the relationship. Probably arnd 12.  And now i have entered my 20s n college n stuff.
All my friends go out on dates have crushes talk to them and stuff. And it just makes me curious..i dont want to cheat on him and stuff..just want to know how these things feel like
. My bf dsnt understand these feelings and thinks i ll cheat on him..but i just want to explore.. AM I WRONG HERE? I even have a crush and I just cant even ask him for a coffee date bcz i feel my bf would think I m cheating on him  :/
 coffee date -more inclined to be his friend bcz hes a good guy plus he is not interested in me.. And is shy so dsnt talk much in front of people.  And breaking up is not an option 
UPDATE : 
I told my bf about this long time back. and he himself said that "he wanted to set me up on a blind "date" and observe from behind.. I found that creepy. And i want to go out on a coffee date meaning as his friend.. And i would tell my bf before. Plus i m curious about these things. About the experience of meeting n talking to new people..not "dating" them as such. Relationships are tough..and I am already struggling in one. 🙄