Down and almost out feeling desperate

My boyfriend broke up with me telling me, he was trading up to someone younger. I (28) also lost my job as I worked with my then boyfriend and was put out on the street also. I did have enough money for food and a roach motel for about 3 weeks. But getting a job was going to be almost impossible as there none going locally. While feeling sorry for myself sitting a diner 2 days later, I heard 2 men talking. One in his late fifties and the other in his late forties. The younger one told the other one who I soon found out was his older brother, he may have missed the boat in having his own family. Had a great career and was very well off and never married and now was missing having his own children. Short version: When the younger brother left the older sat for a while before he left and I'd time to thing and decide it couldn't hurt to ask. I chased after him and told I'd heard his wish for children and straight offered to have a child for him in return for a future for myself. At first shocked, he at least heard me out and of my desperate situation. He (55) decided to risk it as they say, and I was checked over medically and passed every test as was he. He asked how I wanted to get pregnant as he was happy to proceed. I wasn't up on IVF and suggested straight sex an agreement was drawn up by his lawyer and I signed it as it offered more than I'd hoped for. I would get a good place to live and a good paying job and would also be able to see the child. I'd moved in with him before the medical checks and was his personal assistant personal his relatives and friends were told only his younger brother knew the real reason; I was with him being his brother's lawyer. Sex started without checking my cycle first and we would just keep fucking until I got pregnant. I was living very well, and he treated me better than any other man ever had. Finally, I got pregnant and had a baby girl and according to the agreement I would stay until our daughter was weened. But he had gotten quite fond of me and asked would I stay longer. I said I would and would be happy to have another child for him if he so wanted. He said he would think it over and agreed to me having another child for him. I was still sleeping with him and having regular sex also and before I was to ween our daughter, he straight out asked me to marry him. I was a little shocked at first, but soon agreed as I was really attached to him and our child, and he always treated me very well. I signed a prenup which I asked for. Mainly due to my previous experience with men, it mainly said I would always have access to any children, and I would at least get the previous what was in the previous agreement. Well, I'm still married to him after 11 years and we have 4 children. The second child was also a girl and the third pregnancy I had twin boy. But also had a lot of trouble with their birth and so can't have any more children. The boys were okay nothing wrong as with the girls, my husband is best thing ever to happen to me in my life.