There is no law that you must cover your head but there may be, I stress maybe, family pressure for you to do so. If you have children then they will be brought up as muslims, if you get divorced then your husband has custody of the children by law, I believe. Your future husband may take other wives in the future if he wishes and there is not much you can do about this. Also, I am not sure about your citizenship rights, though I don't think they will be much.

I am just pointing out worst case scenarios for you as you have to talk to your boyfriend about this.

"Deaths in the Bible. God - 2,270,365
not including the victims of Noah's flood, Sodom and Gomorrah, or the
many plagues, famines, fiery serpents, etc because no specific numbers
were given. Satan - 10."