Selfish baby daddy! I can’t deal 😪

I have an ex/baby daddy who hardly bothers to put in effort with our 2 kids ever since we’ve broken up. When he does pop in once every 2/3 weeks for 5-10 minutes he acts like we should be grateful & feels as tho it’s enough . But In the mean time he bombards with me messages all day everyday, they are mainly obsessive msgs about me, what I’m doing in life, how crap of a mum I am, how all I want is his money, or about how much he loves & misses his kids and wishes he didnt work so much to see them, but on his days off off or spare time he’d rather drink with his mates than see our kids but still keeps up with the messages and texts DAILY! I’ve been trying my hardest to not let it get to me and remind myself how much better we are without him, but getting texts all day and being absolutely exhausted & drained being a single mama whilst knowing his out partying and relaxing even though we BOTH laid down and had our kids is bugging me and makes me feel even more drained than I usually do. I don’t care for him and dont want him back, I left him to better our life and I’ve been happy since the break up. But I cannot get over how selfish his acting and it puts me in a mood whenever I think about it. How do I deal with him knowing I’m stuck with him for life now 😤