does this fit a square d breaker panel

Not only no, but you didn't even specify which type Square D panel you have. Figure that out BEFORE you buy breakers, which often can not be returned. If you don't understand this, call an electrician.

My box says 120ac is this compatible with thql1120gf 20 amps

Yes, this is a standard 20 amp 120 volt ac circuit breaker

do breakers go bad? If so, how can I tell if I have a bad breaker or a short? I had an electrician come out, but he ran out of time and had to leave.

Yes, they do go bad. If it stays closed and you have no voltage at the terminal on the side, it's bad. If it won't stay closed, it's either bad or you have a short. Replace it with a new one. If the new one won't stay closed, you have a short somewhere on that circuit.

Thql1120gf Circuit Breaker

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Specifications

ASIN	B00WROKUGQ
Best Sellers Rank	#339,474 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #121 in Ground Fault Circuit Interrupters
Brand Name	GE
Circuit Breaker Type	GFCI
Current Rating	20 Amps
Customer Reviews	4.5 4.5 out of 5 stars (120)
Item Weight	8.16 ounces
Manufacturer	General Electric, Inc.
Model	THQL1120GF
Mounting Type	Pole Mount
Number of Poles	1
Part Number	THQL1120GF
UPC	783164085983
Unit Count	1 Count
Voltage	120 Volts

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£175.77

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THQL1120GF Circuit Breaker

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