<human>: Can you provide a brief overview of the text?

I have a male friend (we'll call him Derek) who is a really great guy but is one of those guys who is always single and at the same time always talking about how lonely he is and how he'll never find anyone. I've worked with him a lot over the years on developing confidence and not "trying too hard" so he can be happy and find someone.

So I was delighted a three weekends ago when I was having a dinner party and he said he would be bringing a female guest that he met in his skiing club. He talked her up quite a bit and seemed excited about how much they had in common, etc. 

Sidebar: I watch a lot of porn.

The night of the dinner party, the doorbell rings and here is Derek. He enters and then a woman enters behind him who he introduces. Immediately, I recognize her as a prolific adult performer/porn actress from the 90's. She wasn't high profile enough that just anyone might recognize her (like Jenna Jameson) but I can recall at least 25-30 scenes I've seen her in. I kind of made long eye contact with her after introducing myself and I got the vibe that she knew I recognized her.

I just carried on normally for the evening but after a few hours (and a few drinks) she cornered me in the kitchen and said she presumed I recognized her from her adult film career, which I confirmed. She proceeded to launch into this long explanation of how she wanted to put this behind her and made a life decision not to tell new people she met about her former life. She asked that I respect her decision and not tell Derek, also assuring me that she is totally healthy, clean, and drug free.

I have a big problem with being asked to lie via omission. It makes me feel dishonorable and I openly tell my friends not to ask me to lie for them, ever. On the other hand, I think this news will crush Derek. He's been seeing her a lot in the ensuing days and constantly raves about her and how well the relationship is going. What do I do?
<bot>: My friend is dating a former porn star and she asked me not to tell him. Do I tell him the truth or respect her wishes?