Are you letting the soil in the pot dry out slightly (but not completely) between watering? Stick your finger about an inch into the soil - if it feels "slightly" moist then you have the green light to re-water.

Are all of the buds drying up and falling, or just some of them? I have a few buds that do that from time to time.

Also check for mites under the buds and leaves - look for leaf curling, webbing on the undersides, etc. They might be sucking the saps right out of the flower buds. A sharp blast of water should knock most of them off, but don't do it too hard. If they are on the plant and that doesn't work, try a mix of dish soap and water (about 1 to 10 mixture).

If your humidity is on the low side the buds can dry out too... fill a planter tray with gravel, rocks, shards, etc and set the pot on TOP of the tray of gravels so the water that drains can evaporate and increase humidity.

Jasmines also like slightly acidic soil - since you repotted it it's probably around the right pH (5.8-6.0) but a few coffee grounds couldn't hurt - this will stop any yellowing of leaves. And of course, fertilizing regularly might help, too.

If it's a Jasminum polyanthum remember they generally like 4-6 weeks of temperatures below 60 degrees (but not lower than 40) to set an abundance of buds - any other time they will sporadically flower.

I hope this helps :)