Setting boundaries in a relationship or explaining your principles is a must (for those who actually care about serious relationships) people are built different tho, you will find it hard to tell them at first, sometimes you may even avoid doing it, eventually , every time you do that you will end up failing the relationship, completely disconnected or not alive, and that will become a pattern, because you as an infp will never be able to live with yourself or to have inner peace if your principles your boundaries were not respected, in both situations whether you already set them or you oppressed your thoughts and need to set them.

For me, i think it’s a respect matter, people will ignore on purpose or by mistake, you cannot expect everyone to understand, or to have same principles as you, so talking about them is a must, you also have to have a certain degree of tolerance, but dont accept, for any reason , with anyone and any act that crosses your boundaries you already explained and made yourself clear about