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If depriving your parents from seeing their grandchild is because you're unwilling to forgive, you need help! Life is too short to live with broken relationships. Consider reading Dr. Gary Chapman's book, The Five Love Languages of Apology.
If you're engaged to a man who constantly checks out other women, run! If he does this before you get married, you can be sure he'll continue to do that after marriage.
It's normal for couples to have issues that come up when they get married. Finances is often one of them. Talk about it! Consider holding a weekly conference together in which each of you brings up one item for discussion. That will present the opportunity to bring up issues that concern you the most.
It's important to focus on the present and future state of your marriage, but it's just as important to look back to the past. You must deal with past failures before you can put them behind you.