Why does my battery work only when I jump it

You

ok, it started with my car not starting a while back while i was in the store. i thought i had left my lights on or something. well just by wiggling the battery cable i was able to get it started so i figured my cable was just loose.. months goes by and it happens again only this time wiggling the wire didnt work.. a gentleman that tried to help me thought my cables were bad so i had to call for a jump which started me right up.. after that my problem has gotten worse so im thinking i need a new battery! but today when i got in my car it was dead ahgain but for some reason i grabbed ahold of my steering column and held it tight (i bought the car used less than a year ago and the column was already loose but i didnt notice it till after i got it home) so anyway by me holding it tight and eve kinda shaking my hand as i turned the key wala!! it started. that is the second time ive been able to start my car by doing that but my husband wont listen to me!! help me please is there something in my steering column that could be causeing my trouble or do i need a new battery