<human>: Last week, one of my best friends (let's call her Megan) set me up with her friend whom she's been 'shipping' me with for a few weeks. I'll call her Helen. Anyways, on the night, on a crowded dancefloor, Helen and I kissed but had little time to talk. Over the week since we've spent a bit of time talking on Facebook. She had even asked me out on a group outing the other day after she couldn't make a previous invitation of mine (this has since fallen through for ostensibly unrelated reasons…)

On the Megan front, she and this guy had entered a relationship after breaking up with their exes. They especially wanted to keep it a secret from his ex. Long story short, I unintentionally confirmed a now ex-friend's suspicions about them ... and she is apparently close with his ex. So essentially, I fucked up their secret and his ex found out yesterday. Megan and I talked, and she partially forgave me, knowing that it wasn't intentional. But still...

I am terrified that this has ruined any chance I had with Helen because I was such an idiot. Whilst she didn't blame me when I told her part of the story, she probably now knows the full extent of it and that I am an insensitive idiot. I really like her and want to get to know her better. I am haunted by a fear of rejection after my last relationship, and I am extremely hesitant to ask Megan for help after that royal fuck up. So reddit, what can I do to convince her that I am not 'that guy' and to spend more time getting to know me?

Provide a brief overview of the text.
<bot>: I accidentally betrayed my friend Megan and this could impact my developing relationship with Helen. What can I do to maintain/fix our relationship?