My boyfriend is pushing me away because of stress, or is it me?

We've been on and off for the past 3 years, I finally moved in with him and now I feel farther away than ever. We're stressed trying to find me a car, he hast to drive me to work 1 hour both ways. He works night shift and I work day shift. I know he's exhausted, I feel like he's taking his exhaustion out on me. I feel like he's given up completely on the relationship. What do I do to stay calm? How can I show him that I'm still here and I have no doubts about our relationship? Talking about it constantly makes it worse, he'll end up blowing up on me. I'm afraid we will break up, that's not what I want at all. I want to show him I support him, but I don't want him to push me away anymore. HELP?
My boyfriend is pushing me away because of stress, or is it me?
Post Opinion