When you're together, his toes are pointing away from you.
Our bodies line up when we're in love (heart to heart, face to face) and conversely, when things start to go wrong, the feet are one of the first places you'll see it. He may be with you now, but if his feet are either heading out the door, or worse, towards someone else, he may be looking to walk.
He's no longer interested in sex, or worse, he has a new bag of tricks and a trapeze with the tags still on it.
Barring medical problems, if there's a dramatic change in sexual behavior (less sex, or different sex,) watch out. He's either learning it somewhere else or getting it somewhere else.
He says, "I need some space" or "I think we should see other people."
It's obvious, but we miss it every day. Women will say, "We're not breaking up, we're just seeing other people." If you're seeing other people, you're not a couple. And while he's not technically breaking up with you (so no big crying scene to endure) he's given himself a way out. Of course, the second he gets a little distance, he's going to make a run for it.
When he hugs you, he gives you that little pat-pat-pat on the back.
A person who gives you a hug while patting you on the back is indicating that they are uneasy, and the bigger the pat, the more discomfort they feel.
He starts picking fights about stupid stuff, like which way the toilet paper roll goes.
We find reasons to argue when we want out. If you find yourself bickering over such pressing issues as why Hulk Hogan, not The Rock, should be crowned King of Wrestlemania, your partner is trying to make you look like the bad guy so he doesn't feel so bad when he leaves. "That's it!" he'll scream, after another paper versus plastic bout. "I can't take this anymore! I'm LEAVING!"
If he's looking left, something's not right.
When someone looks up and to the left when they're speaking to you, it usually means they're lying. The look left is an indication we're using the "creative" side of our brains and a good indicator he's telling you a whopper.
Want to know when you're most likely to get the axe? Most experts agree it's somewhere in the neighborhood of the first 3-5 months if you're dating, or around the eight-year mark for married couples. So, stock up on tissues and Ben & Jerry's if you find yourself heading down the wrong road.
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