Confused about life

How do people get to far off track? How do we go from being so high to so low? Is there really a happy medium for people who operate so differently? I need to loosen up and relax...why do I stress simply because my other half doesn’t stress at all? Why can’t I allow her to rub off on me just a little? Would we survive and reach our goals if we both just let go of the bs? I feel like I’m mad at her for not caring...for being so aloof. And why did she change up on me? Why did she go from spoiling me and surprising me to nothing? Did I chase her away? Did I ruin it by not knowing how to accept her caring about me because I’m so fucked up in the head and had been alone for so long that I don’t know how to accept someone caring about me...so she stopped? I feel lost. I feel confused. I feel sick. I can’t think straight. I want to cry. I’m unhappy with too many aspects in my life right now. It’s me. Are we right for each other? Should I let her go? She’s not happy.