Broke up with my boyfriend of 2 1/2 years

I just broke up with my boyfriend of 2 years and I'm in a super low place right now. I started my adult life with him and now I'm going to truly be on my own for the first time ever.

I can't stop crying and worrying about what's going to happen now. All I wanted was to be happy and spend my future with him.

Since we've been together for so long, I can't help but feel like I've just made a huge mistake. At the same time, the logical part of me knows it was the right decision considering everything that's been happening recently.

I've caught him looking at photos of other girls, he's looked up multiple dating apps recently just to "look through at what could be" since he's felt so depressed about us.

I dont have anyone I can talk to about this stuff. I just need someone to help me believe I did the right thing and I'll really be okay.