XOR Encryption Attempt

[AxessTerminated]

Okay, I've been following a thread on here where an AO user explained XOR to me (I forget who, sorry). But anyways, I wrote a simple C++ app that takes an input file, and XOR's it against the corresponding bytes of another file, and outputs it to an encrypted file...but my problem is, why doesn't it decrypt correctly...when I encrypted a TXT file with "hello", i got some weird ASCII characters...expected. But when I decrypted it, I got "helloou". I used the key "this is garbage.".

#include <iostream.h>
#include <fstream.h>

char inpath[50], keypath[50], outpath[50];
char buf1, buf2, buf3;

main()
{
    cout << "Input file: ";
    cin >> inpath;
    cout << "File for key: ";
    cin >> keypath;
    cout << "Output file: ";
    cin >> outpath;
    
    ifstream infile(inpath);
    ifstream keyfile(keypath);
    ofstream outfile(outpath);
    
    while(!infile.eof())
    {
        infile.get(buf1);
        keyfile.get(buf2);
        buf3 = buf1 ^ buf2;
        outfile.put(buf3);
    }
    
    cout << "Process Complete!" << endl;
    
    infile.close();
    keyfile.close();
    outfile.close();
    system("pause");
}