I just let it all out and even used the word 'polyamory'.
blah blah blah (had long talks through some nights)
Decided to stay together and that he will need time and try to undertand me and accept me as I am.
I feel SO relieved now, should have done it before.
But I feel like I'm hurting him by letting him know that 'he is not the only one' although my love to him hasn't change a bit (actually this made me realize that i love him a lot more than I thought)