I need help coming up with something to say to my boyfriend (or ex?)

Quick background: In mid April he left for the Summer to go back home and told me we are taking a “break” as the distance was too much. His reasoning for this was if I found another guy I liked, he didn’t want to hold me back – bullshit if you ask me.. Anyway, he told me we’re just taking a break for the summer and when he comes back in September we’ll resume our relationship. Well lately he’s been texting me less and less; he doesn’t even say goodnight anymore. I looked at his Twitter (which he doesn’t know I have) and lately he’s been tweeting about some girl a lot. So basically I’ve had enough. I want to say something to him, does this sound good? “Why aren’t you upfront with me? Why don’t you just say you want nothing to do with me, instead of stringing me along with no intention of “getting back together” in the fall? It’s very clear that you couldn’t care less about me, since you barely text and are after another girl. That’s fine, I get it. Just tell me so I can move on. ”

Or does it sound to accusatory? Suggestions?