What breed of horses did the thoroughbred originate from? My thoroughbred looks a lot like an arab in ways?

Answers:
All modern Thoroughbreds can trace their ancestry to one (or all three!) of the original sires... the Darley arabian, the Byerly Turk and the Godolphin Arabian.

Here is some info for you:
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All modern Thoroughbreds carry the genetics of three stallions imported to England from the Middle East in the late 17th and early 18th centuries: the Darley Arabian, to whom 95% of today's Thoroughbred pedigrees trace, the Godolphin Arabian, also known as the Godolphin Barb (Because this horse was born in Morocco, there is some dispute among historians whether this horse was a true Arabian or a Barb. However, based on paintings from life, the stallion was clearly Arabian in type; a Barb is built differently), and the Byerly Turk (who may have been a Turkoman Horse rather than an Arabian), together with around 35 mares. There are also other horses of oriental breeding that have been less of an influence but are still noteworthy. These include the Unknown Arabian, the Helmsley Turk, the Lister Turk and Darcy's Chestnut.

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That is why your horse carries some Arabian characteristics...

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All horses can be traced back to arab ancestory so it should not be surprising if your four legged friend looks like one

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You are right. Thoroughbreds originate from English mares and Arabian stallions.

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The Thoroughbred is a horse breed best known as a race horse. While carefully bred racehorses had existed throughout Europe for centuries prior to this time, the breed as it is known today developed during the 17th century in England when English mares began to be bred to imported Arabian stallions. This addition of verifiable Arabian blood coincided with the creation of the General Stud Book of England and the practice of official registering of horses. Today all modern Thoroughbreds trace to these imported stallions.

Some individuals mistakenly refer to a purebred horse of any breed as a "thoroughbred." However, this is incorrect usage. The Thoroughbred is a unique, distinct breed of horse. The proper term for any horse that is a pedigreed animal of a single breed is always "purebred".

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There were three arab horses that contributed to the thoroughbred - the Darley Arabian, the Gadolphin Arabian and the Byerly Turk - three stallions brought to Europe at the turn of the 17th century.

Thus you should occasionally see a dished faced thoroughbred.

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Thoroughbreds directly relate back to the Arabian.
If you go to pedigreequiry.com (spelling sorry) you can trace your horse all the way back to the Arabian.

Actually my Thoroughbred and one of my Arabians have some same far far off relatives.

Most thoroughbreds are out of the Darley Arabian, i would look that up.

My ex racer TB, too looks like an Arab. The Thoroughbred originated from the Arabian because they are stream lined, sure footed, fast, durable and of course those big nostrils that allow them to take in more Air, something very important in the racing industry.

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all thoroughbreds can retrace their ancestory to one of 3 arabs that where brought into the country agaes ago

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Arabian probably. There is a quick way to check. Look closely on his back, and you should see a vestigial hump. That would confirm that he is of Arabian origin. All Arabs have the hump! So your horse looks like an Arab? Wow!