Am I being lied to? Or am I crazy ?

Me and my ex currently live in two different states. We have been on and off for ten years. We are trying to work things out and get back together. He calls me every single day like clock work. Recently a few weekends ago he had his phone off all day. I was in panic thinking maybe something bad happened because it's never happened before. I was very worried. his phone didn't start ringing until ten o'clock at night. I would have usually already been asleep by then because I would have had work the next morning but I was so worried I could not sleep. I even texted him... still no answer. I didn't get a call back until the next day. when I asked him what happened he said he woke up having a bad day and he didn't want to talk to anyone so he just shut off his phone. I was puzzled because he has never been the type to do that....He brushed it off as nothing. I have noticed the calls since then have been becoming less. Everytime we talk it's very short and brief. The conversation seems very forced if that makes sense and he seems very different. Last weekend I tried calling him and no answer at all... I know he was purposely ignoring my calls (I called twice and left one text) because it said he was constantly active on and off on facebook. Well next day I ask him about it and he tells me his phone was on silent and that he didn't hear my calls and that later that night he text me (And I never got that text) that he was going over to a female friends house. I've only heard this girl been brought up twice and he always refers to her as the "friend" which I find rather odd because he calls his other friends by there name. Anywho he precedes to tell me he smoked and fell asleep at her house.... I didn't know what to say so I said nothing... Last night he was acting so strange too. I tried calling him and it would just ring and then beep no voicemail. Then he said he didn't get my call or text from the night before. IDK what's going on but I have just a sick feeling in my stomach now... IDK if I am overreacting or if this is something I should be talking to him about? ... What do you guys think it could be. Anyone ever experience something like this before😢.