My relationship feels weird

I can’t pin point it. But it just feels.. off. I don’t think my boyfriend is cheating on me but I just have this weird feeling.

I feel like he feels like he doesn’t have to try very hard with me because I am always available to him. He will purposely not text me back for 4+ hours but be constantly on social media. He facetimed me a little bit ago and I was like, what have you been doing? And he closed his eyes and he was like “this. Sleeping” but he didn’t even look like he had just woken up. It’s just odd. We also don’t really act like a couple unless we are with each other. I always say I love you first over text or on the phone, which isn’t a big deal but ..??? I just feel like he acts weird lol. Like he will be like “hey I have a question” and I will say what and he will be like oh I don’t have a question. What even?? And he jokes around A LOT to the point where I believe him about everything he jokes about but then realize he is kidding. I’m not sure if he is just being goofy or what the hell? I can add more detail if you need more to give me advice. OH ALSO, he does not text me first anymore. And when I text him he will be like “I just woke up” but he was on Instagram! Like whaaaaat? It seems like he never wants to talk to me or just replies whenever he wants. I just have such a weird feeling but it’s not a “I think he is cheating” feeling. I can’t explain it and I can’t shake it.