What should I think ?

I was in a relationship with this guy for a little over a year but recently ( the last 2 weeks or so ) he's been acting really strange, he's not answering my phone calls & he won't text me back it's like I'm begging for attention. Yet, he posts on social media as if he's perfectly fine. I asked him what was wrong but all he said was he's going through some things & he assured me we would be fine & he loved me but everything took a turn for the worse. The first week we would go from texting all day to every 2 hours to not at all, the second week I would just text him before I go to sleep or in the morning telling him I love him & I wouldn't get any kind of response. I really love him with all my heart but I don't know what to do ? I want to call but I'm afraid I'll go unanswered, I just want closure. Maybe I should call ? should I wait until he comes around ? should I give up on the only person I truly love ? he's all I think about all day, I'm tired of crying at night waiting by the phone to see if he calls, I've been eating everything I can get my hands on. Please help, I'm new to this app so I don't really know how this goes but I really could use this.