Recently I have fallen in love with a divorced guy. He has two daughters aged 9 and 13. Would it be wrong to marry him? Please help me with some advice.
This is a difficult issue and one that cannot be adequately handled in a few words. Please talk to your pastor or a Christian counsellor as there are many issues to consider. For example: Why was he divorced? When did he become a Christian? Is he living in forgiveness? (i.e. personally forgiven by the Lord as well as exercising a forgiving attitude towards others.) There is no black-and-white answer to your question and it is vital that you seek the Will of God for your life before taking this step.
A starting point in your search for the Will of God is to ask the vital question: Is this man a genuine believer, born again of the Spirit of God? If he is not, then your search is ended and you need no further counsel, for the Word does not allow a Christian to be "unequally yoked" with an unbeliever (2 Cor 6:14) and commands us to marry "only in the Lord." 1 Cor 7:39
Meditate on Psalm 32:8 and allow the Lord to "instruct you and teach you in the way you should go".