No peace in relation with spouse or separation from spouse due to any reason or death of spouse act. It all depends on the position of Mars in particular house and sign. If functional beneficial Mars is placed in these houses but in a friendly sign, own sign or exaltation sign, without any malefic aspects on it, will not produce bad results in marriage life. You can read all possible results of Manglik Dosh according to Mars placement in different houses.
Manglik Dosh is all about when planet Mars generate malefic results in someone's horoscope for marriage and relations.If Planet Mars is sitting in first, second, fourth,seventh, eight and twelfth house of lagna chart, it means there is a manglik dosh in native horoscope or kundli.