Venetian Triple Stud Doom Hand

I love the Hi/Lo Stud leg of Triple Stud but that game can be so brutal. The hand that I lost most of my chips was a typical Hi/Lo Stud trap. First 4 cards were A-2-4-5 with 3 clubs.  I catch a 7 for a monster low and scoop potential vs a low only drawing hand. My opponant bets every street which I happily call. Figured out if I call every street can't get busted on this hand plus if I catch high can raise.  I brick out and call river thinking I have half the pot locked up.  Nope he backed into a 6 high straight which leaves me crippled.  I fought hard for a few minutes but couldn't recover.  Finished in 19th, of well next time.  Tony