All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad (saw) is His slave and Messenger.
You should make an inquiry about the person who has proposed to marry you, to verify his obedience to the rulings of Islam and his conduct. If both conditions are sufficient, you may accept his proposal and you are not responsible for his leaving the girl to whom he had proposed before. Prophet Muhammad (saw) said: “If a man whose religion and moral conduct are pleasing to you proposes to you, then let him marry; otherwise there will be great mischief and corruption on earth.” [Al-Tirmithi]
Allah knows best. (Source: islam_web) Classified in Women and Family > First Steps to Marriage