Boyfriend out of country, is he cheating on me? I'll tell you the story in depth if u want to know, email me.

Hello, My bf went out of country. Last time he went, on valentine's day, he lied to me that his gramma died, he stayed for a month leaving school, work and me. When he was suppose to come back, he called and said he was stuck in TaiPei because he was carrying something illegal. He didn't call me until he got back a week later. A month later, I found pics of him with another girl, hugging and sitting next to each other at a restaurant with his family and her parents to celebrate his birthday. I also saw pics of his gramma, that supposedly died, but was still alive in the pics. He said that girl was forced on him by his parents just to take pics, sure. A week and 1/2 ago, he left again, this time because his gramma was really in the hospital and might die. He is going for a month, but i forced him to come back a week early. These last few days, he hasn't called me bc he said he couldn't go to an internet cafe and bc his cell ran out of money. Is he cheating on me wit that girl? dump him?