That's EXTREMELY dangerous and you may have to get the law involved!
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"Mind control?" -lol. No one can MAKE someone be with them. If he was capable of leaving you, why isn't he just as capable of leaving her too if that's what he wanted to do? He's big boy! And for you Cancers, why is it always the OTHER WOMAN'S(And God help her if she happens to be a Scorpio!-lol.)fault and never the MAN'S(who may have been a dog and cheating on her the entire time.) when he cheats, leaves you for another,etc...? HE was the one in the relationship with you not HER! Cancers often act like they worship the man no matter what he does to them(I don't know, but maybe b/c we Scorps won't automatically defend him when he does wrong, it appeals to them. It shows strength and respect for themselves! We don't just automatically jump on the OW when it's HIM cheating and we'll call HIM on it too!!!). How do you know that she even knew about you? Men can lie too kwim and in that case, how is it her fault if he was deceptive/dishonest? And even if he was honest with her about you and it was still pursued, maybe they just "clicked" better, who knows? Analyzing it, won't change it so why focus on it? Just wondering, Are you married to him? If not, then why tell him that he can't leave you and date/marry another person(to be honest, her sign doesn't really matter here)? Imagine yourself wanting out of the relationship or falling in love with someone else and having that man you are with(who you're not married to mind you), won't let you go? How would you feel if you couldn't be with the person you love and want to be with b/c someone is holding you hostage and treating you more as a possession(And Scorps can be guilty of this too if they're not careful.)? Sometimes, even when it hurts bad, you have to put yourself in THEIR shoes. I'm a Scorp, but I have a lot of Air(and some earth) influence in my chart, so I am able to control my emotions better, thinking more logically than many other water signs I know and I am able to judge pretty fairly. As I see it though(as much as it sucks), if you aren't married then all is fair in love and war. We to face it, a BF is not a Husband. And he isn't any kind of man anyway to up and leave you for someone else if he supposed to love and care about you, so what do you want him for? It sounds more like you want to WIN as opposed to actually loving him. As a Pisces, maybe he can sense that!
Sorry, but for you to think she is somehow keeping him there and controlling him with a method of unseen "mind control" makes me think you are dilusional and in need of some professional help(That is unless she is some big time cult leader that he's danger of but seriously, obsession isn't cool. It can take control and become very dangerous)! Trust me, she's not some witch who has magic powers(none of us Scorps do)-lol. He wants to be there. Cancers can sure act crazy when their heart is broken. They dwell way too much on past hurts and are sometimes incapable of knowing when to move on! To be honest, this is why Cancer men scare me so much. I'm a Scorp woman and I would love to have been matched with another water sign, but many are too emotional(Pisces) and insecure to the point of it being scary(Cancers)for me, which is why I found myself a Capricorn(nice and earthy)! Not that I could escape the wrath of a Cancer in doing so. His ex was one! And 20 years later she still can't get over him-and she's married! I would love to know what her husband would think of her obsession with my hubby. I know I'd leave her!-lol.)
Anyway, there are plenty of other fish in the sea(and Pisces if that's who you're into)! Get over it or get some help b/c you're going to pay somehow for it(your mind, health, prison time, etc...)if you don't. Life's way too short to stay focused on the wrongs someone did you(I bet you have your own pains you've inflicted on others too.)or to pine over someone who doesn't want you anymore. You aren't the only person on earth to have their heart broken, we ALL have(even us Scorps!)so snap out of it, forgive him/her and move on with your life! Sorry, I'm not trying to be harsh(I know you loved him)just telling it like it is. You can't torture yourself this way(Cancers really don't need to put themselves through the emotional stuff they do, but many do and it robs them of a lot.). It's not healthy for you and it will keep you from having the life you deserve(and you do deserve to be happy don't you?)
The best sign for Pisces is Cancer, Aquarius, Scorpio, and/or Virgo
In Western astrology, the water signs are Cancer, Pisces, and Scorpio. These signs relate to the creatures of crab, fish and scorpion, and are emotional signs.
Scorpio or Pisces
Pisces can get along with any other Water sign. They include Cancer and Scorpio.
Pisces, Scorpio, and Cancer are all compatible with Cancer.
Taurus, Leo, Scorpio* and Pisces*.
Cancer and Pisces
Taurus, cancer, Scorpio and Capricorn. Also maybe Pisces and Virgo.
Scorpio Virgo Cancer and Pisces
The matches for a Pisces are any other water sign (Cancer, Scorpio, or another Pisces); or the opposite sign for a Pisces, Virgo
Pisces and Cancer. Almost anything else will clash.
Pisces is most compatible with the signs Scorpio and Cancer.