My boyfriends of 3 years cheated on me whilst Travelling together

I've been with my boyfriend for 3 years we did break up for 6 months previously as I found he had been speaking to girls on hookup websites etc but he fought to get me back. A year after getting back together we took the leap and decided to travel to Canada together, we've both got working holiday visas and are here for two years. We've been travelling for 5 months in total and have been working and living in Toronto for about 2 months. We are both working in the service industry so work long, unsocialable hours which has been tough on us. We talked about it and decided we really wanted to work through and fight for our as we were just working to save money to travel even more! So the tough times would only be temporary and would be worth it for all the other amazing this we have planned.

I began noticing a change in my boyfriends behaviour, he would take more pride in his appearance before going to work and he would always take his phone into the bathroom and always kept it hidden and out of my sight. I was looking on his iPad which is connected to his phone and found a girls number, I didn't initially do anything as I though it could be someone he worked with and after a few days it had disappeared. A few days later I found the same number saved under a guys' name. This was instant alarm bells for me as he was hiding this girls number.

I confronted him about it and he initially denied he had been doing anything, I persisted and he then told me he had been speaking to this girl who had given him her number at work, so he initiated the whole thing by texting her. He had deleted all the messages so I had no idea what had been going on and he just said they were chatting, but if it was so innocent why delete the messages?

He then left packed all of his things and I haven't seen him since. He's deleted everything involving me on social media so this new girl doesn't see it, they've spent days hiking etc together, things we should have been doing. The thing that hurts the most is that it's as if I never existed after spending 3 years together.

I feel like I've been completely abandoned in a foreign county and I haven't done anything wrong and don't know what I've done to deserve any of this! I just don't know what to do.