Seriously, idk how to get that 3rd love since the expansion didn't finish yet on that time. So do I still have a chance to get it?
Sadly no:(, you have to create a new save or go back to when you still one heart with him, don't finish the troubles in the den event first since its stopping you to get him to a 3 heart
no. later a new event might appear but for right now there is no way to get a third heart if you made that mistake.