Hi Rui,
Here is some information on divorce from Jesus, the Old Covenant or should I say Mosaic Law allowed for a man to divorce his wife for any reason, he only had to provide a letter of divorce, of course there were other obligations as well, but for me the most important admonition would be from our Lord as He presented the New (albeit more difficult, or exacting) Covenant.
Mat 5:31 It hath been said, Whosoever shall put away his wife, let him give her a writing of divorcement:
Mat 5:32 But I say unto you, That whosoever shall put away his wife, saving for the cause of fornication, causeth her to commit adultery: and whosoever shall marry her that is divorced committeth adultery.
Mat 19:3 The Pharisees also came unto him, tempting him, and saying unto him, Is it lawful for a man to put away his wife for every cause?
Mat 19:4 And he answered and said unto them, Have ye not read, that he which made them at the beginning made them male and female,
Mat 19:5 And said, For this cause shall a man leave father and mother, and shall cleave to his wife: and they twain shall be one flesh
Mat 19:6 Wherefore they are no more twain, but one flesh. What therefore God hath joined together, let not man put asunder.
Mat 19:9 And I say unto you, Whosoever shall put away his wife, except it be for fornication, and shall marry another, committeth adultery: and whoso marrieth her which is put away doth commit adultery.
Paul writes of this as well;
1Co 7:10 And unto the married I command, yet not I, but the Lord, Let not the wife depart from her husband:
1Co 7:11 But and if she depart, let her remain unmarried, or be reconciled to her husband: and let not the husband put away his wife.
1Co 7:12 But to the rest speak I, not the Lord: If any brother hath a wife that believeth not, and she be pleased to dwell with him, let him not put her away.
1Co 7:13 And the woman which hath a husband that believeth not, and if he be pleased to dwell with her, let her not leave him.
1Co 7:14 For the unbelieving husband is sanctified by the wife, and the unbelieving wife is sanctified by the husband: else were your children unclean; but now are they holy.
1Co 7:15 But if the unbelieving depart, let him depart. A brother or a sister is not under bondage in such cases: but God hath called us to peace.
1Co 7:16 For what knowest thou, O wife, whether thou shalt save thy husband? or how knowest thou, O man, whether thou shalt save thy wife?
I hope this helps a bit.
His Peace and Wisdom to you,
Joe