We are truly sorry to hear about the distressing situation you're facing. Firstly, we want to assure you that there is no power greater than the name of Jesus Christ, and it is by His authority that we can overcome any form of darkness or evil. It is only in Jesus Christ that we have access to God and it is in His name that we receive salvation.
The Bible tells us in Philippians 2:9-11 WEB, "Therefore God also highly exalted him, and gave to him the name which is above every name; that at the name of Jesus every knee should bow, of those in heaven, those on earth, and those under the earth, and that every tongue should confess that Jesus Christ is Lord, to the glory of God the Father."
Concerning the issue of someone planting something in your house or outside, it sounds like it could be some form of witchcraft or evil intent. In Deuteronomy 18:10-12 WEB, God clearly warns against such practices, "There shall not be found with you anyone who makes his son or his daughter to pass through the fire, one who uses divination, one who practices sorcery, or an enchanter, or a sorcerer, or a charmer, or a consulter with a familiar spirit, or a wizard, or a necromancer. For whoever does these things is an abomination to Yahweh."
Regarding your husband's intentions to move in with someone else, we want to remind you that marriage is a sacred covenant between a man and a woman, ordained by God. In Malachi 2:16 WEB, God says, "For I hate divorce, says Yahweh, the God of Israel." We encourage you to stand firm in your faith and pray for your husband's heart to turn back to you and to God.
Let us pray together:
"Father, we come before You in the mighty name of Jesus Christ. We plead the blood of Jesus over this situation and declare that no weapon formed against us shall prosper. We rebuke any form of witchcraft or evil intent planted in the house or outside. We command it to be rendered powerless and ineffective in the name of Jesus Christ. We pray for a hedge of protection around this family and their home. We also pray for the husband, that his heart would turn back to his wife and to You, Lord. We declare that this marriage will be strengthened and restored, in Jesus' name. Amen."
Be strong and courageous, for the Lord your God is with you. Do not be afraid or discouraged, for the Lord your God is with you wherever you go. (Joshua 1:9 WEB) We recommend reading continuing to read your Bible for additional strength and encouragement.