How long should i grieve this heartbreak for?

Decided to ask here because I've never gone through something like this before. This was my first love and barely lasted a month, and it wasn't even an official relationship. I realized it wasn't going anywhere and decided to stop begging for love, but i still have feelings for this person and it's been very difficult. It's been two weeks since we parted ways, and i already did the basics (delete photos and screenshots, stopped contacting them, etc). I also reached a stage in which i stopped crying everyday about it. My concern is that i thought i was getting better, but since yesterday it feels like i went back all the way to stage zero. I can't stop thinking about them, and i'm fighting the urge to text them all the time. Also i started crying again (not all the time like in the beginning tho). I'm afraid i'm grieving this love for too long and will end up stuck on it forever. Any advice will be appreciated.