I never thought I would be here

[TrentC]

I am angry at myself for letting her lose respect in me.

BZZT! Wrong answer. You can't "let" someone lose respect for you. That's a decision they make on their own.

How do you come back from that when she doesn't take you serious?

Simple; you don't care what she thinks. You make your changes for yourself. She'll start to believe when it's been 3-4 weeks (or 3-4 months) and you're still the new, improved you.

I have worked my a** of to get where I am at, to provide for her and give her the best lifestyle that I could. This is what I get?!?!

Read His Needs Her Needs and The Five Love Languages.

Just because you have been providing what you could doesn't mean you actually were meeting her needs.

People are complicated; she may appreciate the financial stability that you provide, but been frustrated because she wants to spend more time with you, or needed to hear that you love and respect her.