Those are most likely text messages. "Sya lng gusto k" - The proper phrase would be: "Siya lang ang gusto ko" = He/She is the only one I like/want. "yarehh kahh" -> "Yari ka". An idiomatic expression, meaning "you're toast" or "you're in big trouble". I hope I am wrong, but the impression I get is that the person who said these might be angry about something or towards someone.

Thank you so much, perfect translation

Henry explained it right. "Siya lang ang gusto ko, yari ka." For me it sounds like he/she's telling you you're dumped. "He's the only one I like, bad for you." Or maybe you've taken it out of context. :/