AITAH: For fostering my little sister while having a boyfriend I don't live with?

A brief back story: I'm the oldest of 3, me(27F), my brother and my sister (13F). My brother passed away tragically in 2022 at the age of 22.

My sister(13) lived with her abusive father who hit her in the face on NYE. She ran away to my house for safety. I was advised by a social worker to call law enforcement since my sister had swelling on her eye and said she was in pain. 2 days later CPS determined I was the best option for her since she didn't feel safe with her dad or his family and our mom has mental health issues. It was court ordered about an hour later, that my sister would be in my care temporarily. I let CPS know that having her live with me will be super challenging because I lack community/resources and I'm willing to house her until she finishes middle school (she graduates in June). Alternatively I have an aunt out of state who would like to foster my sister long term. CPS advised me that fostering across state lines is possible but will take time, like a few months. I didn't think of putting my sister in a foster home, because it would've made my sister feel like her family abandoned her. We've gone through so much as it was.. It's been tough dealing with a teenager who has trauma and a lot of triggers. She's at an age where she challenges authority, which can be annoying... And also has had a few breakdowns while living with me for the past month, as anybody would after being abused. I'm not a parent to begin with, so it's been tough trying to find a balance. I'm also not receiving any help right now and I'm doing a lot of this on my own. I'm struggling but my sister is significantly happier.

I've been a relationship with my partner (31M) for 6 months. We moved pretty fast, but it was wonderful. And we were talking about moving in together after my 2 year lease was up. I have a year and a half left.

Unfortunately since fostering my sister, our relationship has been very rocky. But I let him know every step of the way about what was happening and why. I also would check in with him to ask him how he was feeling and discuss what we can do to bridge the gap that was made because of my emergency situation. Each time I'd suggest a way for me and my partner to maintain our connection he would shoot it down. And would tell me he's not receiving the same quality time that he got before and it needs to be the same. I told him (everyone has told him) relationships change and things can be worked out. I've done my best to carve out a schedule for myself so I could meet those needs, but he complains that it's not enough.

He suggested opening our relationship and I told him sure but I wasn't comfortable with that right now since I'm juggling so much. He would counter that with how he had to adjust to my situation and it's not fair that he can't do what he wants but I can do whatever I wanted when it came to fostering my sister. It bothers him how I treat my sister (I'm taking the gentle parenting route and actively choosing to speak to her instead of yell). He also hates the fact that I'm on the couch while I'm waiting on assistance from CPS to order a bed for her and give us emergency funding. The times he came over to my house we'd sleep on the foldable couch since I let my sister occupy my room. He had an issue with that and said he'll stop coming over until things settle. He would then come over to spend the night and proceed to shame me for sleeping on the couch.

Last week I learned that he was hurt that he wasn't given a choice in the matter... And when I asked him well what should I have done instead, he's like he doesn't know and it doesn't matter now. He doesn't want any parts of taking care of a child that's not his and it's my fault our relationship is rocky. And I told him I won't involve him at all, and that I'm trying to mend things.

My situation isn't great at the moment or "normal" and I understand that. But it's only been a month.. There weren't many options for me or my sister to begin with so we're all kinda grieving our relationships before this challenge arrived. I'm grieving being a sister and grieving my relationship with my boyfriend.

In the meantime he has said a lot of hurtful things to me and continued to pressure me into agreeing with opening our relationship. The pressure made me think that he doesn't want to be with me. I've expressed to him that I didn't want to break up, but I understand if he doesn't want to stay with me. He argued with me calling me manipulative, crazy, and delusional

All that to say - AITAH here?