I've been constantly stalking my husband's exes since 2014 and we've been married 4 years
Have you ever talked to your husband about his exes?
I tried to but he thinks I'm delusional.
Stalking your partner's past exes is wrong as it is creepy and obsessive behavior. You should trust your partner to be faithful and remain with you. If you have fears that your husband is going to go back to one of his exes, you should talk with him for reassurance.
Fuck off, it's none of your business who I stalk.
While I can't stop you from doing it, I have to emphasize that stalking is a kind of assault, and it is against the law.  You could get into a lot of legal trouble if you keep this up, and your husband could also leave you if he feels threatened.