tomato plants

Maybe you are keeping the soil too moist?! Tomatos are best regarded as Mediterranean plants - i.e. they like warmth, lots of light and not too much water. I am surprised your plants have flowers already - they are very early! Mine have very small embryonic flowers at the moment. Do you have them in a greenhouse? Or are they outdoors? If outdoors, all your problems are probably due to your plants being too cold. If on a windowsill, the temperature is probably flucuating too much. Can you give more info about the growing conditions or a photo? :-)

they are outside but our temps are 80s and 90s. not cold at all.