My pseudo girlfriend is leaving for two months

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So I got divorced about 3 years ago and since then I've shunned from relationships and focused more on one night stands and random dating. I've had two real relationships (IE: girlfriends) in those 3 years but several random hook-ups. About two months ago, I met this girl who worked with my ex-wife (my ex and I continue to be friends) and my ex was actually the one who suggested we should get together. That went on for a while until one night at the bar we really hit it off and became inseparable for 2 months. Meaning, we spent every night together, talked on the phone every day when we weren't together and went on some wonderful adventures together. The thing is, before we had met, she had plans to spend the summer in the Keys with some family. I knew this going in but was wrapped in the moment of finding someone that turned my world inside out (in a good way). I guess I didn't handle this well and started getting jealous when she'd spend time with other friends, especially guys. I guess I have trust issues. We ended up breaking up. She's very independent and doesn't like answering to any one. I feel like a fool now. We still spend all this time together and she said she wants to see where things go when she gets back., She leaves tomorrow and I will not see her for 2 months. I know where I messed up and am seriously working on those trust issues but I'm plagued now by thoughts of her meeting someone over the summer and hooking up. I'd never know about it but that makes it worse, the doubt. My question to you all is how can I convey that I made a mistake and should I even try? Or just let her go, get my life straight and see where things go when she gets back? Any advice?