Genesis 13: 1 - 11

 ¹And Abram went up out of Egypt, he, and his wife, and all that he had, and Lot with him, into the south.
 ²And Abram was very rich in cattle, in silver, and in gold.
 ³And he went on his journeys from the south even to Bethel, unto the place where his tent had been at the beginning, between Bethel and Hai;
 ⁴Unto the place of the altar, which he had make there at the first: and there Abram called on the name of the LORD.
 ⁵And Lot also, which went with Abram, had flocks, and herds, and tents.
 ⁶And the land was not able to bear them, that they might dwell together: for their substance was great, so that they could not dwell together.
 ⁷And there was a strife between the herdmen of Abram's cattle and the herdmen of Lot's cattle: and the Canaanite and the Perizzite dwelled then in the land.
 ⁸And Abram said unto Lot, Let there be no strife, I pray thee, between me and thee, and between my herdmen and thy herdmen; for we be brethren.
 ⁹Is not the whole land before thee? separate thyself, I pray thee, from me: if thou wilt take the left hand, then I will go to the right; or if thou depart to the right hand, then I will go to the left.
 ¹⁰And Lot lifted up his eyes, and beheld all the plain of Jordan, that it was well watered every where, before the LORD destroyed Sodom and Gomorrah, even as the garden of the LORD, like the land of Egypt, as thou comest unto Zoar.
 ¹¹Then Lot chose him all the plain of Jordan; and Lot journeyed east: and they separated themselves the one from the other. 

Abram leaves Egypt and Lot is with him. God told him to go alone, to separate himself from his family and he did not. There is a consequence for such things and everyone messes up. Lets not be too hard on Abram. Where did he go? He went back to where he started and had built an alter to the Lord, he returned to the Lord.

Sure Abram brought Lot with him, his was a lonely job and he wanted to be with a loved one. Isn't that understandable? Would you want to travel by yourself or would you want to be with someone who understood you, would you want support from family and friends? I would.

Whatever his intent, Abram was not allowed to bring Lot with him for God had other ideas. They went to a land where there was not enough for both of their flocks, yet, both had plenty. They had two choices, reduce their wealth (number of animals) or separate. They chose to separate. They chose wealth over love.

Lot chose to go to the better spot. He was told he could have any land and chose the better one or at least it appeared so at the time. Abram let Lot choose not caring and trusting in the Lord. Never negotiate with a man of God and if you do then always choose what is in his best interest. The next part of the story shows what happens when you do not.