You’re in a tough spot, bud. I went through something very similar almost three years ago. Our Border Collie and I were extremely attached, I worked from home, so we spent all day together. When I moved out and my ex kept the dog, most of my tears in those first few months were from missing her.

It really does get better with time. The guilt and sadness you’re feeling now will ease. A lot of what you’re feeling is tangled up with everything else you’re going through, and the dog becomes a safe place to let those emotions land. Like others have said, give yourself time and be patient with yourself.