I'm nervous

Me and my dog have been through a lot. We were in an abusive relationship. Me almost 4 years, her almost a year. We both went through so much, I took a lot of her beatings, she tried to bite his hand or leg when he was punching or stomping me (only sometimes). We both have had knives to us, we both have been tied up and beaten, and we are both out now. Safe. But, I'm nervous. She has known my new boyfriend since we've known each other (since last August). I started spending the night right away when we got together and now I stay the night every night. In the beginning, I didn't bring her over because I didn't want her getting attached. Now she spends the weekends with us. But what happens if he leaves us and she gets hurt all over again? We've been together 8 months, he already talks about late 2018. But I can't help but be cautious/nervous that she'll, and me, get hurt again. I don't want her thinking she's unlovable. She completely loves him. Thinking about him being here all the time and then not at all just makes me sad. Just needed to vent a little.