ive never been in a relationship but i legit don& #39;t see what the big deal about cheating is

OBVIOUSLY if i were to enter a relationship with someone i wouldn& #39;t cheat on them bc that& #39;s an unspoken boundary

but i legit just don& #39;t really get why it& #39;s such a big deal? besides stds ofc

i know it& #39;s like, a breach of trust and people don& #39;t like "sharing" but like. why not?? why is it a breach of trust in the first place. the more i think about it the more i think being able to be intimate with only one person would be lame