The guy should have said there is an issur of baal tashchis to spend money on the tunnel instead of taking the bridge. he obviously felt hurt by what the girl said so he had to be nasty, it shows that he is not a good person to want to get married to.
The girl is outright stupid. Why would she prefer a guy who wastes money. Her priorities are way off the good mark.
His behaviour shows that he lacked sensitivity and was prepared to hurt her feeling in retalliation for her having hurt his. HMM sound like a case of Lo Sikom.
Not a good Jewish story. Too many NY materialistic vibes imbibed by both.
If either of you are reading this, I suggest getting a translated version of mesilas Yeshorim and read it seriously. When you are done, try dating again.