1. Laughing.
I am not LAUGHING anymore, and I begin to notice that I'm more serious, definitely a bad sign.
2. I feel worse about myself when I'm with this person.
If this continued, I realized I had to leave. Emotional support is essential. There have been men who thought what I did was ridiculous. No support for being me or following my heart.
3. Control.
People control out of fear. It manifests in anger - passive or active, it's still there. My freedom is important to me. Of course control results in tenseness. and again, having to live up to the expectations other people had for me led me to break free. Sometimes it was simple to see, their mothers were different than I was, cooking, talking, interests etc. I wasn't even the same as my mother. Despite growing up in the sixties and seventies, some of my men were definitely "Mad Men" with expectations.
4. Jealousy.
I decided a long time ago that if I had a reason to be jealous, it was time to go. If I did not have a reason to be jealous, then it was time to go. Once, I had a boyfriend who did his best to make me jealous. When I realized that, it was only a matter of time before I realized he was fooling around. Don't be jealous and do not stick around with a jealous mate, your life will be miserable. Who wants that?
5. Sex.
If a relationship has other problems, such as anger or other forms of control, sex can become a duty and something to avoid. This was easy to notice. If the interest in sex really waned, I could feel myself emotionally detach. A strong sexual attraction with a negative, depressed or angry partner makes it harder to go. When the sex is not that great and the rest of relationship was a mess, it was easier to go.
Feel free to add your own, those are my reasons.