Long-distance relationship coming to an end

We've been together for two years, but we're in different cities. Honestly, they started acting really cold recently; they used to tell me everything about their day, but now it feels like I have to force them to talk. Last night, I called them via video, but they sent me to voicemail and then said they fell asleep, but I saw them outside in their friend's story. Their dishonesty really hurt me. Do you think it's time for me to end things, or am I just being paranoid?