Read Genesis 31:7:” yet your father has cheated me by changing my wages ten times. However, God has not allowed him to harm me.“
Having gone through different trials Jacob finally got tremendous blessings from God. God kept to His word by protecting him. God made him prosperous and even though Laban had bad intentions towards him, God took care of each single situation by saving Jacob and rewarding him. So, if you are cheated on, put your trust in Him. He is just and will protect you. Even if you were deceived, God can give you many times more than you lost.