Can i ask for spousal support?

I have been in common law marriage with my husband for almost 19 years. We have 4 boys together. Our relationship has been rocky since the beginning. I guess that's what happens when you don't take the time to know somebody first.I was 17 and he was 21. He cheated on me when my first son was 8 months old. I never caught him but his friend told me. My world came tumbling down but he denied it nonstop. I left but since i had no money i came back to him so my son didn't have to suffer. Time passed and i brought my aunt to live with me for a few months while she got back on her feet. We had a strong bond since she is the same age as i am. She went to church and had a boyfriend but was also seeing my brother in law. My husband thought it was okay to try and get with her but i didn't find out until a month later and that's because my mom made her come clean with me. He was trying to come on to her but she pushed him away and she didn't know how to say it to me cause she knew i would be crushed. Needless to say i confronted him and of course he denied it so i left him. That was the most traumatic experience of my life because i knew i was a good wife and didn't deserve being treated with so much disrespect. After a month passed he went all the way to georgia to beg for me to come back. He swore up and down nothing happened between him and my aunt but just the thought of him insinuating himself to her made me sick to my stomach. Again i felt like i had to return with him cause my son need his house back and i was low on money cause when i lived with him he never let me work. I decided to give it another chance cause he told me he loved me and couldn't stand the idea of me and my son being gone. I was so young so i was very vulnerable to anything. My mother begged me to stay with her but i couldn't stand the idea of being a burden to her at age 21. Time passed and all was good at least that's what i thought. He had his own mechanic shop but i never knew how much money would come in or out. He thought that as long as he paid bills at home he could do whatever he wanted. He started drinking and having friends at shop every single day and started neglecting my son and me. This time i was 26 so i started building some courage and decided that i would no longer put up with his behavior. I started going out and doing my own thing. But one thing, i never stopped taking care of my son. He is my life. My husband started drinking non-stop and hanging with wrong crowd and he lost it all. After he lost it all non of his friends and family especially his mother who i consider a gold digger helped him out. He went to georgia and got help from my brothers and kind of got back on his feet. That's because he was deep into drinking and god knows what. Needless to say i was back here in texas living with parents and working so that i could finally get him out of my heart and pretty much start over but that was almost impossible cause my son missed him dearly and that was my weakness. He came back and looked for me and pretty much begged for me to go back with him but i wouldn't budge. We did end up together and he was actually changing and i got pregnant with 2nd child. We moved close to my mother and farther from his family that never helped him. They only get close to him when he is making money especially his mother. 6 years have passed since then and now we have a total of four boys. But now he is 40 and his family are back in the picture and he is starting to act shady again with money and with me. I've grown mentally ever since but now we have 4 boys that love him very much. My husband and i really don't spend any alone time and barely talk because he is overweight and as soon as he sits down he falls asleep. But he does have time for his family and i feel that i have done so much for him and i feel so unappreciated. I even helped him get his green card so that my kids would have their father around. But it seems that whatever i do for him his family receives all benefits except me. I would love to move on but now we have a mobile home that will be paid off soon but we have credit card debts and i and i'm afraid he won't pay since most of them are under my name. I want to keep my house for my kids of course but i don't know if i have the same rights living under common law marriage. I also suspect that he is talking to another woman but i really can't be for sure but the feeling is there. I guess i've been through so much with him that i guess i just plain don't trust him anymore. I'm 36 now and i really want to move on without hurting my kids and i want to make sure they have what they need. Can i get spousal support for all these years that i've been with him? i really could use some good advice. I am not afraid of working for them but i feel he should pay as much as possible for all the grief he has put me thru.