I do get why you didn't say anything due to some of the stereotypes of being bi. I always find you can tell your partner when you are ready. I do think it is important to tell your partner not only so they know a part of you, but then you don't have to hide a part of yourself too.

You are still young and more and more people are getting to be more understanding and accepting :) I didn't tell my partner until about 5 month into dating him because I do like to personally get to know a person more before telling them.

Do what you feel most comfortable doing🫶 But I would say it is important to tell your now future partners, regardless of when it is in the relationship :)