They could of course just waive you in but yes turning up for a 6 month visit is likely to raise a few questions and to be honest if they then decide to question you further, well US BF, being made redundant, a few touristy places to visit (in 6 months?)
Having said that when I came over I had a friend who was here on a B, he would disappear every 6 months, go back to the UK, visit friends in Australia and then he would be back. I was always surprised how he got in, a couple of times he was grilled but still made it though. Anyway the B expired and he know that if he applied for a new one they would take one look at his travel history and it would be a quick no. But he ran it for 10 years.