Tuesday stands for Lord Mangal.
He is considered to be son of Goddess Earth. He is considered a bad planet God. The strength of humans is in hair. Hence if we cut hair on Tuesday our strength becomes less and impact or bad impact of the planet comes on us. Hence it is advised that cutting hair and such things should be avoided on Tuesday.
In some myths Planet God of Tuesday is engaged in duty of breaking marriage couples passing their life happily. This seems to be a childish and cruel and evil part played by Lord of Tuesday.
However it is a Truth test. Couples who love their ego more than each other gets splitted by this Gods interference. Only Truth survives. Rest all gets destroyed.
Couples at body level (Need) may at the max last on Earth. In heaven they get changed. So it is not true love. Polygamy rules heavens, the heaven of Lord Indra, the abode of sensual enjoyments.
Those couple at mind level (Likeness) may last for one more birth. The couple may continue 1,2 or 3 births more because Likeness factor is strong in them. Again this may or may not be True love. Being unaware of mind control tactics, they may not last for more centuries.
Those couple at intelligence level(Dharma), knowing Dharma and control laws may continue for 7 human births as per spiritual laws of doing marriage in presence of Lord of Fire. The oath taken and godhood of Lord of Fire helps them to continue for 7 births. Here again this may not be True love.
Those couple at soul level are called Sats. Sati term refers with this level couples. They cross the heavens of Lord Indra and reach the Creator's abode. They live eternally for one full day of Creator. In one full day of Creator, 14 Gods of Heavens exists. Means heavens are destroyed 14 times in 1 day of Creator but the Creator's abode continues to last for 1 full day of Creator. This lucky couple at spiritual level are Carried to Creator's abode. They are the True lovers.
Planet Gods like Mangal ie Lord of Tuesday uses their full powers to split the couple but they never split. Lords of Heavens tries to lure the couple wrongly but they remain dedicated. Hence this couple, the True lovers reach the highest heavens. It is said even heavenly beings feel jealous of them as they reach a heaven superior to them.
So Lord of Tuesday is ever eager to split couples as He hates untruth and untruth relationships. He wants human to cling to Truth, may it be True love in form of love partner or God. But He hates untruth.
It is said calamity is a big bliss of Lord Narayana. Because in calamity the truth comes out. As long as you are rich all will accompany you. But when calamity falls on you, the Truth comes out. One by one all leaves you. And one day even your wife. So Lord of Tuesday hates all such humans engaged in untruthfulness. He is an eye opener. Couples passing His test reach Eternal abodes but most of them split as their relationship is based on selfish interest and not on true love.