I found out two days ago that my bf (M23) has had this arrangement with his "friend" (F40) for about 2 months.

She is a mother and has her own business and does well for herself and is only working retail to get her residency.

I've had a hunch for a couple of months now that something was going on but couldn't put my finger on it exactly.

I managed to get ahold of his phone and saw that she was calling him "babe" in basically all the text messages. He was saying it as well but not as frequently.

He confessed to me that they have an agreement where he calls her pet names and occasionally drives her places/home (nothing further) in exchange she gives him a cut of whatever she sells from her business. He's been in debt for a long time now and is trying to get out of it, it's hard to make money where we live and I'm understanding of why he chose to do this.

She knows of me and that he is in a long term relationship but of course still pursued knowing that he couldn't say no to free gifts, food, and money. Which he shares with me.

As stupid as it sounds, I trust that he loves me and wants to be with me but he doesn't want to give up this opportunity to make "free" money. He comes home to me every night and always let's me know where he is and what he's doing with her but for some reason he won't show me their messages. His reasoning is because he doesn't want to trigger me and mess things up for him. He has boundaries set in place with her and I trust he won't break that but it doesn't change the fact that the situation makes me feel very uncomfortable/insecure.