Need to vent

Im finns be 42 in 2 days in my life seem like it falling apart. I have a man and we been dating since march of this year. I have been single for years before i met him and that was by choice and working and always worry about taking care of my bills and my kids. My kids is older now and my youngest is 16. I have 5 grandchildren and my life includes putting them first and watching my grandkids. Now since i have a man. I have informed my kids that things will be changing and i have a life of my own and i want to start doing things that makes me happy. My kids is ungrateful and always want me to do things for them and never think about me. The past weeks on the weekends is the only days i have off working during the week day. My son ask me to watch the baby so he can go to work. I informed my kids that the week is my birthday week and i have plans. I have plan to get my hair and nails done and my boyfriend was suppose to come with to nail shop. My son decide to leave and go to work and leave the baby. My 16 years old dont like babysitting. I was focused to take the baby with me to nail shop. My boyfriend noticed i had the baby and decide he didnt want to be with me at the shop. I want by myself. He stated he want to do something or take me somewhere after. Now he had to be at work that day as well. My boyfriend didnt call me all day until hours later to.ask me what i was doing. I spend my birthday week alone and bored. Today is Sunday and text me good morning and nothing since than. Im struggling with being happy and my kids not allowing me to have a life. I dont know what to do. My birthday in 2days and im.stress and sad and havent even done nothing. My ex been calling me and want to take me out to eat and im struggling on if i do that. I can be causing a problem in my relationship.