I need some advice, I think my bestfriend is jelous because I'm dating her brother in law, and not spending al?

Ok, I need some advice as to what to do!! My bestfriend who is 5 months pregnant, set me and her brother in law up, which she was so super stoked about, but now that I'm spending all of my time with him, she has been getting mad at me. She just bought a new house, and we have been working so hard on it. And he has now bought a house, and I've been putting alot of time and effort in it. She told me today she is upset because she feels that I am putting my all into him now, and she feels like he doesnt appreciate it. Do I tell him what she has said? Or just sit down and talk to him and ask him if he's using me, or what the deal is?? This is really weighing heavy on my mind. I dont want her mad at me, but dont want to be used by a d**n man either. I really dont think he's using me though. Altho that's kind of the way she made me feel. WHAT DO I DO!!! And another thing is my kids absolutly love him, they are crazy about him, and he is the only guy that I've dated since my divorce that the kids have been this crazy about! Please only serious answers!! Am I overreacting??