What does this mean? German to english translation..?

I wrote "Ich liebe dich" which I know means "I love you"

Then they replied "Ich liebe tu"..I don't know what that means

And then a random person said "Auch, aber tu is suesser"..I don't know what that means either

can you translate the last two please?What does this mean? German to english translation..?
I am German, but what he says makes no sense to me either. There is no german word tu. The only thing I can think of is that it is some short form for something, like what we use in texting.

That random person makes no sense either, literally (except for the tu) 'also, but tu are sweeter'.



Maybe you should ask your german friend about the tu.

In german, if he wanted to reply likewise, he would have said: Ich liebe Dich auch.What does this mean? German to english translation..?
I love too----------------------Oh but you are sweeter!