If you want to be happy, you shouldn't date a pessimist. Your Tango has proved that. Here are a few signs that their website claims are toxic for any relationship:
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Does he always play the victim? Does he refuse to take responsibility for his actions? Then he's unhealthy to be around.
You can't view everything as "right" or "wrong," or "good" and "evil." There's a lot of grey area. If he can't see that, his perspective needs to change.
His pessimism will rub off on you. If he's unhappy, even after he gets a promotion, then he doesn't know how to enjoy life.
It's not that difficult to put gas in his car. If he won't go to the gas station without whining and complaining, he's not right for you.
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You don't want to be with a man who changes his mind constantly. That means he'll eventually change his mind about you.
Yes, life is scary. However, he can't let his fear of failure hold him back in life. If it does, he'll never get anywhere.
If he doesn't know what it's like to be happy, he must not be happy with you. You two deserve better, so find someone who appreciates having you around.
Are you in an unhealthy relationship?