I feel TERRIBLE 😭😭😭😰😰😰

I've been with this guy for 3 years now, today is the anniversary, and we've known each other SOOOOO WELLL!! I know his family and he knows mine , and it was serious , we even planned for the future AND..he's the first guy i lost my virginity to.. That's how special he is because i was saving myself for marriage but for how stupid i am , i thought he won't leave and today he cheated on me :) with a whore :3 so am i a slut??? And will i ever get through this?