Protect Your Heart From Fake Love No Matter What.
A manipulator is the worst type of person as they tend to be selfish to the core, and this can be made even worse in a Relationship where people often find themselves being manipulated by things like guilt, insecurities, and doubt. An unreliable/manipulative partner is simply going to be an ex-partner eventually, so why put all that work into something that is going to crumble regardless? Being with a reliable person is a must in any relationship you want to last.
Being with someone you cannot rely on is counter-productive to any type of security you could ever want in a relationship (and who doesn't want security? Right?), it truly goes hand in hand with trust, being in a relationship with a reliable person bring about a deeper connection with your partner you know they will always be there to catch you when you stumble and will always have your back indefinitely.
There is no reason for anyone to have to endure the misery of a spouse while in a relationship. The whole reason for a partnership is to have mutual support, but if one side of the party refuses to even try to eliminate the personal misery they carry, what is the point from staying in a such a relationship? Tolerating a manipulative spouse is not good under any circumstances so don't.
