My Bf Found Out…

I may be a very useless person…
Now, I have a new boyfriend… For almost 1 year... Until 18th of November.
Our relationship is good… Smooth and going on well…
Just a few days before, my bf found out…
That there was something …
That I was thinking of the past (Sad memories) my ex bf…
But he was good to me…
Because he said that he would try to help me to forget about him…
And he said very clearly that if I am still thinking of him, he will break up with me…
Ok, I will promise you that I will try my best to forget about him and please give me more time…
Thanks you… I LOVE YOU Forever…
Maybe I have hurt his feelings too…