The Church teaches, as does Jesus in Mt 19:9, that every Christian marriage is indissoluble except by the death of one of the spouses. No power on earth can dissolve a ratified and consummated union of two baptized Christians (one in which vows have been validly exchanged and which has been later consummated by intercourse).
A valid marriage requires the proper intention at the time that the vows are exchanged. The parties must intend to make a marriage, which by definition is a life-long communion open to new human life. These are called the unitive and procreative meanings of marriage. If either of the two meanings of marriage (an indissoluble union and procreation) are excluded by the will of either the man or the woman no marriage is made on the wedding day (Code of Canon Law §1096).
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