Since your wife HWR's regular fuck buddy "commuter guy" stops by to fuck her on his way to or from work, it seems possible he's married. That is, during your wife's initial screening, when she asked him whether he's married, he may have sensed immediately the answer she was looking for was "no," and lied about that.
If you wonder why he would want to fuck your wife regularly if he's married, the answer may be that HWR is more responsive.... a lot more responsive.... with her multiple orgasms (up to 3) each time. If "commuter guy" and his (hypothetical) wife have been married for many years, she may not find sex with him particularly exciting any more, and convey that with her attitude when she's in bed with him, including by not reaching orgasm. Or, "commuter guy's" wife (assuming he has one) may not fuck him at all any more.