My husband and I decided to get a divorce and terminate our marriage. 
Oh no!  I am so sorry to hear that.  Hopefully it is happening on good grounds though.
Well let's just say that he broke the law by not being monogamous. 
Jeeze... I am really sorry to hear this.  Do you guys have any kids? 
Luckily we did not, that would make it worse I would think.
Yeah.  Not to mention how rough it is on kids because they don't understand things like that. 
I thought we could get an annulment where our marriage would be null and void but we couldn't.
How long were you married?  I think it has to be under 90 days to get that done.