Recently, I was leaving an FWB/potential future gf's house, as I left I noticed a car parked in front of the vacant house next door with some guy in it talking on his phone. I pull out of her driveway and as I'm driving down the street I notice in the rear view the same guy getting out of his car and walking toward her house. I drove past 2 hours later to see if the car was still parked out front, which it wasn't. The next day she tells me she was up watching movies all night because she couldn't sleep (the reason I left is because she told me she wasn't feeling well). The following day she texts me to say she made dinner if I want any. She immediately replies to my response (usually a slow responder) that she's all of a sudden not feeling well and she'll call me later, which she didn't. (this made me think maybe she texted me by mistake). Anyhow, I drove past her house to see if the same car was parked there which it wasn't. Does this behavior/scenario sound suspicious and was it wrong that I drove by? All I wanted was confirmation that someone else was there, it felt wrong and I don't plan on doing it again, but I don't really want to pursue her further if there's another guy she's not telling me about. How bad is it if she saw me driving past, not that she did.
*also, technically I didn't drive past, I drove close enough to see the driveway, then turned around (which I won't do again).
*also, technically I didn't drive past, I drove close enough to see the driveway, then turned around (which I won't do again).