One of the hardest things we have to do in life is really putting god first especially when it seems to mean either choosing Him and the gospel or our happiness. When we have faith that if we do as god wants us to do we will be happy that is when we are truly blessed to find that happiness that we seek. While marrying someone outside of the church is not necessarily a truly bad thing, if you feel that it will lead you to leave the church and your faith behind in your case to be with him then it will never truly bring you happiness. Sometimes a person might pray and feel very strongly that they should marry a non-member where their example will end up leading that person to eventually join the church, but unless you feel such an answer is right, it won't help you in any way. I've seen far too many people struggle or leave the church from deciding to marry someone who did not have the same principles and strength in the gospel that they did. I promise you the lord will bless you if you choose whatever path he wants you to take.