Help! ' seeing someone ' issues

Olivia
Me and This guy hung out a lot went for dinner although apparently they weren't 'dates', I liked him a lot. But he was still caught up on his ex even though he was hooking up with others - which I get can help! We stopped talking for a month and a bit because of it! Then two Mondays ago he asked me to go to the circus with him so we did and it was as friends but he kissed me. 
Then on Tuesday this week he admitted he liked me and he was over his ex, and he wanted an us but because he's leaving for American in a month for work. He'll be away for three months. So he said we'll just go on dates and when he's back we'll give it a try which I agreed with! 
I asked that because we both admitted we're into eachother, send soppy cute texts wanting to see eachother, plan dates etc are we just seeing eachother or are we talking or sleeping with other people too? A part of me hopped he'd say no but he said yes as he wouldn't want to stop me from that, and that he hoped I wouldn't ask him to stop until he's back. He just said if we do don't put it on social media, which I wouldn't anyway! 
It shouldn't hurt me but it has and now I feel so stupid because I like him and I feel like we're going in circles.  Any advice?!

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