Honesty is the best way to go before asking him.What's The Best Way To Ask Someone To Marry You?
He needs to know that you had an abusive Australian boyfriend that you were hopelessly in love with off and on who sometimes was in America and Australia simultaneously while you were pregnant with this new guy's child three months ago and also finding out at the same time that you were dying of neural pathway degradation which was presumably cured by Commander Data and Admiral Haftel in a revolutionary new procedure they developed after the death of Lal from the same condition, and that after the procedure saved your life and you had a baby on the way with a real man you loved but rejected proposing to you multiple times you contemplated suicide and sought advice on how to do it here (holy run-on sentence, Batman).
These are the kinds of things potential husbands need to know about their wives (and vice versa), because if all that can happen to you in the past three months, he's going to feel like he's 100 years old from stress by the end of the honeymoon (probably best not to go to Australia for the honeymoon, by the way).
Goal!!!