<human>: It was really hard to bare the jealousy, trust is of utmost importance to me, and in spite of everything I did to earn her trust all I got was feeling guilty and it really broke my heart.

My question is this, given the fact she is super insecure about herself even though she is a gorgeous girl, and thought I was sleeping around (I wasn't nor did I want to), she brought up several times that she wouldn't mind bringing another woman to bed.

All the men might jump and say I hit a jackpot here, but intimacy is a bit of a holy thing for me, she was not another girl I fulfill my physiological needs with. And I told her I was not one to share our intimacy with anyone, not even another woman. 

I also have to mention that I was the one to open her up to enjoying her body and exploring her sexuality, but still it feels rather strange to me.

Can anyone explain how being insanely jealous to the extent it was the reason enough to give up on a very important person, and having another person in bed co-exist?

Can you summarize the given text in a few sentences?
<bot>: Ex was so jealous I had to end our relationship, how can it be she doesn't mind having another woman in bed?