Brutal opinions please

Background: had a child as a teen. Single mum for 12years.

Met my partner when she was 12. Been with partner (living together 4years) nearly 5years. We had a child together when my teen was 15. Massive age gap. Child now 2 teen now 17. We live in a two bed house so room is tight and toddler still in our room. I’m now approaching 37years old.

My partner wants us to have another child. I originally wanted my toddler to have a sibling he could grow up with. However, my partner was not as supportive as he lead me to believe he would be with our child. Took me ages to lose the baby weight (which took its toll on me mentally). Partner no longer has a regular job/income. I work, cook,clean,majority child care- he has our son while I’m at work. Money is tight. Room is tight.

He says I’m wrong for now not wanting another child (I’m still in two minds. I feel like I want another but believe it will take its toll on me and our relationship and it’s not fair on children considering our financial situation). But I can see myself with another child but I am getting too old so it would need to be sooner rather than later and I don’t think the time is right as such.

I feel confused. Would I regret bringing another child into the world just so my son has a sibling to grow up with? Or is it selfish not to give him a sibling to grow with!

My teen was a lonely child and really struggled socially (obviously others reasons added to this)