I feel nothing for her anymore. Just feel bad for her. What do I do?

We're both 35 years old. Been married 12 years. Two kids. Stood by me while I fought workers comp and got through a bad injury. I've helped her through plenty too. It's been twelve years, a lot has happened.

She's never been a particularly affectionate person. Intimacy wasn't a priority for her. I've told her constantly, I needed more. She threatened to leave me or that I'd wasted her life each time she wanted to get pregnant unless we had a kid. Said she'd change and be more available (not just sex). Each time it hasn't happened. She's distant, has no passion, and I feel like a roommate that has been used as a sperm donor.

I've told her all of this. Told her I am tired of feeling like I'm only needed, not wanted. Told her I've fallen out of love with her. I'll always be there for my kids though. She says she loves me but there'd be no way to tell honestly. I told her I wanted a divorce but she's wanting me to "give her a chance." This has happened before and it was different for a couple weeks only, then back to the same indifference, passionless pecks on the cheek, and keeping me at arm's length at all times. I don't want to give her a chance. I feel like I'm done.

I feel like shit though. It's been twelve years with her. I'm utterly miserable and don't think it's going to get better. Considering the time that's been invested, either I call it quits and give my best effort to be happy, or I stay and spend the time I have left feeling unloved because of feeling indebted to her.

What's you guys/gals opinions?
I feel nothing for her anymore. Just feel bad for her. What do I do?
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