Applying for faskh

I have been married for almost 10 years. I have 2 wonderful boys. My husband was a recovering addict when we got married, with my 1st pregnancy he relapsed and since then it's been rehab in and out. He has been in and out of work also. Recently he was detained, I have however helped him through all this because I love him. I'm so tired of this uneasy marriage as happiness only last for so long. His addiction is affecting the kids especially my eldest of 9yrs old... Is it wrong of me to want to walk away from this marriage? He keeps on promising that it's the last but then he ends up disappearing for days and I'm not even sure if he has someone else in his life. He disappeared again on Saturday evening and this time around took my wedding bans probably to sell it.

Can I asked for Faskh? I have tried to hold on to this marriage but I cannot endure all this hardship, sleepless nights and stress. I'm emotionally drained.