Advice?

I’ve been talking to this guy for 6 months, He’s been away with work abroad. He’s back now and I’ve seen him twice. On both occasions we’ve slept together but he’s never finished and today after we slept together it felt like he was in a rush to leave. I have a feeling he talks to other girls as when I’m with him he hides his phone, I feel like this is a really big red flag. I ignore his messages a few times a day as I don’t want to sound to keen and he’ll always send me another message back. Do you girls have any advice for me on what to do?