Feeling like a single mum

I have a baby girl who will be 11 weeks old tomorrow and my partner has gotten so lazy recently doesn't help me at all I do the night feeds all week as he starts work at 4am however he doesn't work on Sunday and never helps on Saturday nights! I feel so down and exhausted I know it's part of parenting but when he would rather spend time with his mate than spend time with his daughter and help me out it's getting too much for me if I'm honest 😭