when i do exercises with dumb bells like bicep curls, i find that late in my second set or early in my third set my grip on the dumb bells would give. i wear gloves. is it because the weights that i use are too heavy? or am i holding the dumb bells wrong?

i will just keep doing it. your grip strength will catch up eventually.

you most likely have weak grip. add more grip-centric accessory work such as heavy high-rep dumbell rows, heavy farmer walks and/or deadlifts.

never heard of that. how do i do it?

too lazy to google ?

Hold a hoe upside down. Insert big plates into the stick and walk around in the gym for 2 minutes. Repeat this 3 times

i lol'd at 'hoe'!

I tried this yesterday but she kept screaming some nonsense about getting dizzy.

Was I doing it wrong?

You need to hold longer, after the initial state of dizziness it will be silence.
purpose is to ensure you focus correctly, if you're distracted by the screaming you failed.

lose the gloves, it makes it harder to grip. calluses actually help as long as it doesn't break, your skin will get stronger too (true story).

What u say is damn TRUE bcoz when im a newbie in this sport i use glove n my grip is a bit weak.... then i take off n throw away my glove... early ur skin will started feel pain but after a while u will get used to it and ur skin become more stronger...