I miss my Alabama sweetie

I’ve been struggling with a long distance relationship I’ve been in and the man I’m in the long distance relationship with is from Alabama. Well, the last time we’ve talked was Valentines Day and, when I try calling his cell phone number, all it says is “The number you dialed is not a working number please check the number and dial again” Hmm, I don’t know anymore since I’ve been in pain emotionally. I know when we were in the relationship before and I told one of my closest friends, she wasn’t too happy since there is an age difference which I’m 24 and he just turned 40 not too long ago. I also haven’t been sleeping well at night since I’ve been exhausting myself. I eat when I want too, and I’m perky when I need to be so none of my closest friends would notice the way I’ve been feeling. David his name is called me in January after 5 months when we stopped contacting each other and we got back in the swing of things since January. The phone calls increased to where he would call me, and I would call him everyday. I’ve been anxious, fearful, ect for him since I really feel a close connection with him even though we haven’t met yet. I’m supposed to leave to take a vacation to Alabama this Summer and take the college semester off. I don’t know what to do or think. I miss him! I love his Southern drawl. I’m from Michigan by the way just to let you all know. What should I do? Should I give more time since I haven’t heard from him since after Valentines Day. He’s a Marine on reserves as well. Do you think he got called back in? I’ve been thinking allot of reasons of him not calling me. I know I’ve been told maybe he hasn’t paid his phone bill could that be it? Anyway, I know I went long and I would appreciate some advice thanks.