<human>: Condense the text into a few key points

I am very good friends with an ex-girlfriend of mine.  We dated for just under a year several years ago.  In the time since we have hooked-up a few times but never on a consistent basis and never with any hint of reigniting an actual relationship status.  

Recently I have become enamored with her friend and .... roommate. This crush is mutual.  I know because we have acted upon it; in secret and with no trace of detection.  She has even stayed over at my place a couple times.  We like each other and really want to be able to date each other to see what could happen.  

Our plan was for me to approach the ex and plant a seed that I was interested in the roommate and was considering asking her out but that I wanted to check with her (the ex) first.  It didn't go well. At all.  She was very upset and basically said it was off the table.  The ex cited disrespect and tastelessness.  

Now I am a combination of sad and resentful.  I was/am super enthused about meeting a girl that I really felt excited about getting to know better!  And considering the feelings are mutual - it doubly stings.  But since our courtship has been deemed forbidden I am angry with the ex and don't want to really see her at all currently.  And the roommate and I don't know what to do but are not willing to carry on a secret relationship as it is way too risky and just plain wrong.  We don't want to be liars and the only reason we ever did was to protect feelings.  Now we are in a real bind and I don't want to risk not exploring the possibilities of getting to know her.

I should also mention that the roommate has made no admission of feelings towards me to the ex; as far as I know.

I understand what I want is a bit of a dick-ish thing to do and normally I wouldn't be so reckless with a valued friendship but I really have a good feeling about the potential relationship with the roommate.  With her I feel things I have rarely felt in life.  It feels very natural.
<bot>: Want to date a good friend/ex-gf's roommate.  Ex will not allow.  But I am really interested in the roommate and don't want to relent.