Is this appropriate??

[Juliana Cortes]

Hi everyone! Just need some advice on this issue: I've been wholesaling for about a year, and a couple of months ago I got a new buyer. Seems ok but while I was showing a house to him, he gave his card to my seller. I find that to be inappropriate. Why would my seller need his information to contact him?? He is actually a big time full time wholesaler in this area. He's been doing this for YEARS. Anyway fast forward to the next properties, lately he's been somehow offering exactly $4,000 above my buy price for the last 3 deals and I suspect it's because he's getting the sellers to tell him exactly what I paid for the property when I'm not there during his initial walk through. I know $4k is not bad but I'm thinking he's being sneaky about this. Should I allow my buyer to give my sellers his card? Should I continue to send him to my sellers house ALONE for a viewing? I don't know if this is appropriate please help!