why don't I feel anything from phone sex anymore?

I've been dating my boyfriend for over a year and him and I met for the the first time in July. Before that him and I had phone sex alot. I have a vibrator and that's how we would get things done. I was also a virgin before my trip and after leaving I can no longer say that. It's been a month since I got back and we just had phone sex for the first time because I've been so uninterested in the idea of it now that I've had the real thing. But now I'm laying here after having phone sex with him, lying to him and telling him I'm okay even though I'm crying because I feel almost empty inside after getting off. It was fun during but now I just feel like it was worthless... I've never dealt with anything like this before and I'm not sure I want to say anything to him because I dont want him thinking it's his fault. I dont even understand why I feel like this. I love him so much. I shouldn't feel this empty after everything...