Should I Marry Him? Seeking Advice on Infidelity

Question
Hi Daniel,
thank you for your time on reading this. I need your personal opinion about my problems. my partner and i will get married by the end of this year.but currently, i just caught him seeing other girl behind my back. He knew this girl through online. from the beginning i knew there's something going on between them and i started to investigate. I called the girl, and she told me that there was nothing special between them, but they have met and they always talked on the phone.well, what really hurts me is that he is flirting with other girl behind my back and my mind keep on thinking that i am not his priority anymore because when he was with this girl,he just didn't called anymore and didn't care about my feelings anymore.i have found out everything right after he decided to stop being friends with her because he said he knew that he will marry me soon.Now, he is asking for a last chance from me,he said that he will prove to me that he will not repeat the same thing again, that is why he wanted to marry me.the question is, can i believe him?and with what he did, does he deserve a second chance?am i doing the right thing to marry him?i realize that men are so hard to be loyal and honest,but some men told me that some other girls came into their life just for fun, but yet they will still come back to the person that they really love. Can that be trusted also?I really need to know what do men really want in marriage that could avoid him from cheating or having other women in their lives.and how can i get an honest marriage?

Regards.
Thank you

Answer
Your boyfriend may not share the same values and beliefs about fidelity in marriage. Talk frankly with him about it. My first thought is "if in doubt, don't."

Here is an article for a happy marriage and what principles are needed: http://prlog.org/11691763