I want him back but it’s a difficult situation

We’d been going out for 1 1/2 years. Basically myself and my ex broke up as he was moving across the world for 3 months (college trip with friends) it was devastating and we were both extremely upset and we promised eachother we’d stay in contact. It was silly at the time. He’s been gone a month now and he’s contacted me 5/6 times. We are both in better places now I have started a new career and he’s the only thing that’s missing. Last week it was all getting too much and I told him we needed to stop contact for a while. It was getting too hard for him to keep saying all these nice things but not wanting to be together at the same time. He agreed and he apologised and told me how much he loved me and missed me. That was just over a week ago. So I’ve been doing no contact for 8 days now. I miss him so much and keep getting this weird feeling he’s seeing someone else over there and I don’t know why. We had a great relationship most of the time and I know what we had was special and that he’d never throw it away. All I want to do is tell him I miss him, and I know he’d return the favour. I need to know how to get him back from the other side of the world. I don’t know what to do anymore. I’m at a loss. Any help is greatly appreciated.