Am really sorry about what you are going through the initial first stages of herpes are normally very painful but it gets better with time,
About disclosing like you have mentioned you are only responsible for informing your future partners, unless you and your friend who happened to be your ex have plans of getting back together I wouldn't let it bother me if I were you, I understand you need a friend to talk to but if you find it so hard to do it now that it actually makes you cry then it's OK to put it on hold considering that the 2 of you are just platonic friends for now, as time passes by and you accept your herpes status you will realise that its only a nuisance and it doesn't hinder you from having great relationships it might slow you a little bit but the pros is that you get to weed out the wrong people in your life and only end up with those who see you as worthy of dating and appreciate you beyond herpes
The more you disclose the more you will get confident to talk about herpes even to your friends and with time it won't be that burdensome don't get stressed over disclosing it can always wait as long as you are not getting physical or intimate, don't let rejection get into you as well. Rejection is apart of living with herpes, something you will have to embrace
Rem to take care of yourself by reducing your stress levels, herpes thrives when your immune system is down with stress