Am i a jerk or what????

ok so i got a txt the other day and it was from a number that i never knew. So it said hey hunny how are you i miss you etc. etc. so i was thinking it could of been some ***** my dad is with trying to start something or some crap like that! so i pretended to be "the guy" that she tought she was talking to, so its been 3 days and i am still taking to her cus reason being i think she is still in love with this guy and he left her and came to the u.s and she seems so heart broken and the whole conversation thing has gotten so personal cus i was trying 2 get info incase she was the ***** i thought she was. ok so ? is how do i get rid of her with out hurting her and her knowing she got the wrong #? I dont wanna be a ***** or n e thing cus i know how it feels to have your heart broken! so i need a way of just telling her 2 stop texting me or something! i just dont want 2 stop responding cus i know it would hurt her as well. PLEASE HELP! sorry for the long story!