Why must a non-Catholic get an annulment before marrying a Catholic?

My boyfriend is a divorced Lutheran. His former wife is Catholic and their marriage was blessed in the Church. Why is it that he, a non Catholic, must get an annulment before he and I can get married in the Church?

Hi,

It’s pretty simple. If he is still validly married, regardless of his religion, he cannot be married to a second person at the same time. The annulment process can determine if the first marriage was valid or not. A marriage is presumed valid until it is proven to be otherwise.

Fr. Vincent Serpa, O.P.

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