It doesn’t sound right because it isn’t right. Heaven only knows where you “learned” that sex should only be had for popping out babies! You are entirely free to make decisions about the number of children you would seek to have, you just aren’t free to disrupt the nature of the marital act by separating its unitive and procreative aspects. Hence - when a child is not desired at the present time, avoid sex during the fertile time of the month.
I’m not totally clear on what actions of one party are such as to hinder the salvation of the other…but the Church recognises there can be occasions when separation is necessary, and it recognises that there are occasions when the civil/legal divorce procedure may be necessary. [See the Catechism for details.] The Church does however say that remarrying is not possible if the first marriage is valid. This derives from Jesus’ own words “What God has joined together, let no man separate”. Thus, the only path to a licit remarriage is to determine that the parties did not fully and properly commit from the outset (annulment process).
Remaining together is not demanded when the circumstances render this unviable.
Jesus addressed this directly, saying that the reason that Moses allowed “divorce” (implying remarriage) was that because the people at the time were “unteachable”.
I am not trying to persuade you to change your opinion, but the correct Church position should at least be known.
