Long term relationships

What’s your opinion on long term teen relationships? I’ve been with my bf since 8th grade and we are now going to be seniors in HS( so almost 4yrs)our junior year he started a new school and we were on and off for about a month(October).. he just wanted to see what it was like with someone else and to experiment but it wasn’t really what he wanted once he kissed someone new.. I think it was just a confusing time for him but we did end up back together and it’s honestly better than before.. sometimes I do wonder if it’s normal for me to stay in a committed relationship at my age. We were both each others first kiss and first everything pretty much but while I was single I didn’t wanna rebound so I’ve never kissed anyone but him and sometimes wonder what it’s like to kiss someone else but at the same time don’t want to because I wanna be with him. Is this normal? Just thought I would ask and see the feedback I got.