This is a little complicated (and long) but stay with me. I’m struggling with this need to hear perspectives and opinions.

My sub (31F) and I (47M) were together for over 2 years. I am Daddy and she is my babyrgirl. We had a deep, strong DDlg relationship and legitimately fell in love. I even collared her. We are both partnered with other people and because of complications on my side, I abruptly ended it around March or April. We had time to talk, say goodbye but it broke her. She was devastated and I was lost. 

She posted here on Reddit about the breakup and found a few people that she was able to talk to. One guy, I'll call him "reddit guy" stuck around as a friend and really helped her. He was going through a breakup as well and they helped each other through it. This is where I bring up that reddit guy is a Dom. He wasn't HER Dom but A Dom. I'm not sure of the timeline but they became more than friends and started a long distance relationship, meeting once IRL for sex and I don’t know what. I haven't asked about details because I'm not sure I want to know, but he did help her start to work back into her sub and little self. He helped her in a way I wasn’t able to when we were together…. with  personal improvement. Along with working back to her sub and little self, he helped in other ways, with life stuff. Helping her pull herself back together in a real and meaningful way. So much so, that she was ready to start looking for someone new. 

Fast forward to today, or last week rather. I’d recently started posting on Reddit again for someone and she’d just started looking too and found my post. We started talking again and have decided to try again. I am her Dom and she is my sub. He WILL NOT BE HER DOM, this was discussed, BUT she wants to keep her personal improvement relationship with reddit guy. They won't be meeting IRL anymore unless I decided to share her with him, but they do still have an emotional bond that is akin to a deep friendship 

So, the question is… can a sub have a dominant person helping with personal improvement that isn’t her Dom?

TLDR; Dom and sub brake up, sub was devastated, Reddit friend later found out to be a Dom, turns into LDR, helps her back to life and is able to help with personal improvement the way I wasn’t able to. Dom and sub are now back together. I am her Dom, she my sub. She wants to keep him for personal improvement and they have an emotional connection (which i’m OK-ish with). See question above.