OK, Sweetness....if you want to hurt yourself, stalk your ex. If he is the past, let him go! Sorry but it had to be said.
That being said, and my foot being firmly in my mouth, let me give you one more bit of unasked for advice.
No intimacy before monogamy.
and if you aren't comfortable discussing monogamy with a guy, why in the world would you let him inside of you? Sex is now a health risk. Not just a pregnancy risk or a social risk, but a health risk. Take your time, hold hands, make him wait. He seems to be wanting a lot, going out of town is a big thing.
And another old expression, don't sh** where you eat. In other words, don't date at work. The age difference doesn't bother me, people mature at different rates. Just make sure he isn't looking for 'fun', at your expense. You will have to go to work and look at him everyday, whether this works or not.
Slow down, take your time, make sure it's right. If at anytime you feel pressured, you ARE. If at anytime it doesn't feel quite right, it ISN'T! Remember, hold out for the breath taking, mind blowing relationship.
You will be glad you did. Trust me on this.
It's Cerberus and Persephone's GrandChin.