Your fiance should definitely go see his Dr and have a talk with him/her. Something has happened to him, or he has a condition that he should get treatment for. Without more information, it's hard to say what condition it could be
Dromophobia- Fear of streets
Dystychiphobia- Fear of accidents
Gephysrophobia- Fear of crossing bridges
Kainophobia- Fear of anything new
etc. etc....
It could be a lot of things. Maybe something happened in your fiance's past that he doesn't feel comfortable talking about? There is something there though, and your right to question what's going on. Encourage him to seek medical help, or talk it out with him.
Best of Luck,
Ryan
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