:salam2:
i remember reading once that if a married non-muslim woman becomes a muslim, while her husband does not, the marriage is still valid. the reasoning was that islam upon taking the shahadah wipes away one's sins prior to islam. that if she were unmarried at the time of her conversion, then she would be obligated to marry a muslim man. there are some that say that she must divorce the husband. it is a tough situation indeed.
dear sister, i implore you to at least say your shahadah. if your were willing to say the shahadah, that means that you believe islam is the truth. there are things that ALLAH SWT has made haram that may be hard for us as human beings to understand,but we must obey. there are many of us here on this site that have lost family, friends, husbands, wives, jobs, education because we embraced islam. we fought the good fight because we have been revealed the truth and that truth is islam.
i can't tell you what to do, but i say that you should be patient and give your husband time to embrace islam. don't let the opinion of one imam discourage you. seek more advice from different scholars. again be patient. i believe that you believe islam is the truth. but be mindful that your eternal soul is at stake. if you become muslim, forget the whole marriage isssue for a second. ask yourself, would my husband be able to adjust to me praying 5 times a day, fasting during ramadan, wearing hijab, not wearing makeup or listening to music? to me, these are the biggest issues. people have gotten married because of each other's piety; and some marriages ended because the husband wanted to watch tv instead of praying, wanting to eat during ramadan, buy huge tv instead of giving in zakat etc. in other words do you think that your marriage can work out while you two are living different lives? that's the main idea, i think the marriage to a non muslim situation should be given patience, but if your lives begin to part, then i would leave. because we have to put god before loved ones and desires.
may ALLAH SWT guide you