Should I breakup with him?? Please I need advice.?

So my boyfriend and I have been dating on and off for about four months now. During Halloween is when he stopped talking to me. No texts and no calls from him whatsoever. I finally just stopped trying to talk to him all together. My birthday rolls around and again no calls or no texts. I decided to break up with him and for a little bit I was happy and then the memories stared coming back. Early December My friend was on his Facebook and showed me a picture of him and this girl uploaded from his cellphone on November 2.. two days before my birthday. It crushed me a bit and later that night he texted me saying that his phone was shut off and that he had to go to Florida for his grandpas funeral. We ended up getting back together but the picture of him and the girl was still lingering in my head. If his phone was shut off then how in the hell could he have uploaded that picture? I haven't talked to my boyfriend since Christmas night. We made plans for Friday to go see a movie. Wednesday no communication, Thursday i asked him what movie he wanted to see didn't respond, didn't talk to him on Friday. I called him today and his phone rang and no answer. Everyone thinks I should break up with him but i wanted some more feedback on my situation. He always tells me he misses me but whenever we make plans it always falls through and we end up having to wait another week. We have not seen each other since October.