Hey @Norakirk0213 welcome to Reach Out and thanks for sharing your situation here. I can see how challenging it is for you to feel like you're raising your stepson full time, whereas before you saw him only every other weekend. It's even more difficult because his bio mom doesn't see him and on top of that, your husband works long hours. I also feel for your step son, having gone through some difficult situations in his life already. I think it's commendable that you want to protect him from the negativity you experience.
Have you discussed your feelings about all of this with your husband? Maybe before you do that, you can try and identify what your needs are at the moment (in relation to parenting your stepson). Do you need some time to yourself? Do you need for your stepson's dad to be there more than he currently is?
There are some parenting-related resources that you can look into (in addition to ReachOut Parents resources):
Parentline https://www.parentline.com.au/ 1300 30 1300
Raising Children http://raisingchildren.net.au/
Sharing here on RO is a great step, sometimes talking about the things that are weighing us down can help us feel heard and 'lighter'. So please, continue to share here.
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