Possible breakup during pregnancy..

I'm almost 11 weeks pregnant with my 2nd child. Me and my boyfriend have a 7yr old together also. This pregnancy was not planned and was honestly a huge shock to me as I thought I couldn't have more children.. Boyfriend was excited right away and I was just in shock for so long I didn't know how to feel. I am happy, but at the same time I feel lost.. Me and my bf have not been in a good place for awhile and I've been really thinking about going our separate ways.. I'm just sick of being taken advantage of and pretty much feel nothing is going to change.. I just feel so much more lost now that we have another little one on the way.. I don't know what to do from here..