Hey OP, I am going through EXACTLY what you are going through.
I been with my girl for over 8 years, married for over 5 years. We lived a very happy life together. She loved me so much and i loved her. She seemed to be my perfect one. We were meant for each other. I loved her so much that i would literally take a bullet for her, God forbid, if it ever came down to it.
We had struggles in life with finding our own home (we rented with my mom) . Overtime, she got tired of not having our own place. So I tried to search for one. Finally, after 1 year, we finally got our own place.
So we finally moved out and the plan was to start a family a month after getting our own place. We were So HAPPY. It was a dream come true. But it never happened.
Unfortunately, while we were settling, my wife fucked her co worker. It was going on for over 8 months.
I found out that she cheated.. On my birthday. This devastated me so much that I wanted to kill myself. I NEVER expected her to do this because she kept telling me that she loves me so much and she would never cheat. I am still in shocked..
But as time passes, i am getting just a little bit stronger.. It isn't easy at all. We did everything together. Now we are divorcing. It's that much tougher because I still love her so much. Every where I go, i think about her still. Also tough because everywhere I go, it reminds me of her. We ate here, had a picnic there.. Ate at this restaurant, that restaurant. I can't escape the memories of her.
But again as time goes on, it's that much easier to let go. You just need to hang in there and get support from those that will ALWAYS love you, your family.
Focus on improving your life so that you can be happy. Strive for that better job, or go back to school and get another degree. Improve on yourself so when you become more successful, he/she will realize that what they did was a mistake.
Take great care OP. You got this.