open relationship

My husband and I have been having a lot of problems latelyand they aren't just small problems they are problems that have to do with the core of our hopes and dreams, all along I have wanted a house in my small town I grew up in and a family and that was enough. He wanted the same things until about 6 months before our wedding when he applied for the army. We've been trying to make it work and he's been away at training for 4 months and we've only been married 6. But I'm really unhappy being alone all the time and I don't want to be an army wife moving around all the time. On top of that we've recently learned that I have pcos and so fertility is an issue for me. With him being away we can't even consider fertility treatments or testing. I feel like I'm giving up everything I want for this thing that he has only wanted for a few months. Anyway we agreed that we should try seeing other people and when he gets back in a couple weeks we will date each other and hopefully figure out if we can get past our differences. Or if there's someone better out there. Last night I went out with an old flame and spent the night. Now i feel really guilty but at the same time really happy about how things are going with the old flame. We agreed to having an open relationship but I don't know if I made the wrong choice.