HELLP!! Have you ever love 2 people at the same time??

I love my fiancé I’ve been with him for going on 7 years now our wedding is in October. I’m also in love with my best friend and she feels the same way. I feel so free to be myself with her like a part of me I’ve been hiding for so long I can finally enjoy, my fiancé knows how I feel about her and knows we’ve kissed several timesavers he’s almost encouraging me to explore things with her but I feel so conflicted I want to explore this part of myself but I feel like I’m cheating on him and I feel like he is going to get jealous at some point. Please I need advise without terrible judgment I’m doing enough of that on my own!