Can't decide

So I'm not sure if I want another baby. I currently only have my one 9 month old and if I did have another one I'd like to get pregnant now so they're close in age, but I really don't know if I want one. Having another one wouldn't even be for me it would be more for my daughter to have someone to grow up with. I feel perfectly content with the 1. I don't get any breaks or help from my SO with this one and I just think 2 would be too much to handle for me. If I end up waiting so I can makeup my.mind then I definitely don't want another one because of the age gap. I especially don't know because I haven't been happy with my SO I've honestly been completely miserable, I feel like I'm always by myself we hardly talk we don't have sex. I've talked with him and nothing seems to change.