Unwanted pregnancy please help.

Im 20 years old. I turn 21 in February I had my first child when I was 14 years old, he’s now 6 going on 7. His father was never involved in his life and still isn’t. Fast forward now I have another baby boy #2 who just turned 1 on December 22 2019. My boyfriend and I have been on a really bumpy road. Ever since his biological son was born he treats me and my 6 year old extremely different. He gets frustrated when ever my older son plays to rough with his son (our son). He complains about me and my son not being too careful with him. he constantly says he’s only with me for our son, and that he only loves his son. ( mind you ) he makes those comments in front of me and my older son. My older son also repeats it all the time, he says “ because daddy only loves his baby, and not me. “ it breaks my heart. I don’t want to be with him anymore, we no longer have a connection, we are no longer a team. I have told him several times this isn’t working and I just don’t know what he’s waiting for. and most importantly he treats my older son as if he doesn’t exist, and I do not want that for my child. He complains whenever he needs something for school or whenever he ask’s for a toy, or even food. I am a stay at home mom. I am currently not employed but would love to be, because a family cannot live off of one income. I receive child support for my older child from his (bio - dad) he gives me about 500$ but it goes to my contribution to our living expenses so I pay half our rent. I would more than anything love to use it on my older son because technically it is his. We have a 1 year lease, that is up in October 2020. We can either renew it or part ways. Which I feel parting ways would be healthier and more beneficial for my boys. And just have an agreement for 50/50 custody for our smaller son. because he will not be around my older child when we split. I just found out January 8 that I am 6 weeks pregnant with his child. I am at a lost for words, I am in disbelief. Mind you when we have sex I don’t want too. It’s not rape it’s not consensual it’s just there. I’m unhappy I feel so broken lost and alone. I don’t know what to do, I have an appt with a nurse today to get information on a local abortion clinic. I am not asking for any judgement I just desperately need someone to help. I need some advice, some raw honest truthful advice. Please help. Also He doesn’t have any words for this pregnancy. He says we aren’t going to “ kill a child”. nothing more nothing less. Please please help.