EventListener wont recognise new buttons - for-loop

Question

I have only started js recently, so i hope this makes sense..
I have made a simple dynamic form which starts with a table of 4 rows. After the heading row, the remaining 3 rows have +/- symbols which are to add or delete rows as necessary.
The add row functionality is currently working, however, even after assigning the correct class to the new row, the event listener wont work for the new buttons (even thought i have re-assigned the number of buttons within that class).
After adding the row, i re-assign btnAddRows and when logged to the console it is increasing with each row added. I can't figure out why it wont get captured in the for loop?
Thanks
//select elements on DOM
let btnAddRows = document.querySelectorAll('.btnADD');
let myTable = document.querySelector('#SecProp');
let myTableRows = document.querySelector('.tableRows');
for (let i = 0; i < btnAddRows.length; i++) {
btnAddRows[i].addEventListener('click', function () {
console.log(btnAddRows.length);
btnAddRows = document.querySelectorAll('.btnADD');
const rowNum = Number(btnAddRows[i].id.slice(6));
// console.log(rowNum);
// if (rowNum === myTableRows.length - 1) {
// addTableRow(rowNum);
// } else {
addTableRow(rowNum);
// }
btnAddRows = document.querySelectorAll('.btnADD');
myTable = document.querySelector('#SecProp');
myTableRows = document.querySelector('.tableRows');
});
}
const addTableRow = function (rowNum) {
//insert row into table
const addRw = myTable.insertRow(rowNum + 1);
const newRow = myTable.rows[rowNum + 1];
newRow.className = 'tableRows';
console.log(myTable.rows[rowNum + 1], typeof myTable.rows[rowNum + 1]);
const cell1 = newRow.insertCell(0);
const cell2 = newRow.insertCell(1);
const cell3 = newRow.insertCell(2);
const cell4 = newRow.insertCell(3);
const cell5 = newRow.insertCell(4);
cell1.className = 'column1';
cell2.className = 'coordsColumn';
cell3.className = 'coordsColumn';
cell4.className = 'buttons';
cell5.className = 'buttons';
cell1.innerHTML = `<td> ${rowNum + 1}</td>`;
cell2.innerHTML = '<td ><input type = "text" name="" value = ""/><td>';
cell3.innerHTML = '<td ><input type = "text" name="" value = ""/><td>';
cell4.innerHTML = `<td ><button class="btnADD btn btn-success" id="btnADD${
rowNum + 1
}"> + </button>`;
cell5.innerHTML = `<td ><button id="btnDEL${
rowNum + 1
}" class="btnDEL btn btn-success"> -</button>`;
};