I do not know what disappointment you have experienced, but I would encourage you to return to Scripture and read again what God says about keeping his promises. Here is a sampling of what the Bible says about God’s faithfulness in carrying out what he has promised.
“God is not human, that he should lie, not a human being, that he should change his mind.”
“Does he speak and then not act? Does he promise and not fulfill?” (Numbers 23:19)
“The LORD is trustworthy in all he promises and faithful in all he does” (Psalm 145:13).
“For no matter how many promises God has made, they are ‘Yes’ in Christ. And so through him the ‘Amen’ is spoken by us to the glory of God” (2 Corinthians 1:20).
“If we are faithless, he [God] remains faithful, for he cannot disown himself” (2 Timothy 2:13).
Life’s circumstances might seem to suggest that God has failed to carry out his promises, but God’s track record is perfect: he always does what he says. With his age-old question of “Did God really say?” Satan continually seeks to attack God’s word and get us to doubt God’s faithfulness. What God really says in his word is that he is faithful to all his promises. I pray that God’s own words about his faithfulness encourages you in the faith.