Lesser Than 4

It's greater than something that's lesser than three,
It's something that's lesser than four.
But be careful;
It's not equal to, but greater than three...
Then again, it's not greater than four.

<3. A heart;
90 degrees off, but that's alright!
It's so pretty, you think.
So apt, so nice...
But yeah, just in case you want to say more;
Simple, real simple.

Use <4!