Guys, Did we have sex too soon?

I worked with this guy for two weeks, then he was away on exchange for one year. We hit it off right away and have been keeping on touch over the year he has been away. Now that he is back he asked me out and we had an amazing time. I had decided not to sleep with him straight away, BUT it was something with the chemistry that made me unable to refuse. I told him that we shouldn't, and that I don't trust him enough for sex yet, but my body kept saying yes to him and ultimately we still had sex. This was two days ago. We chatted a little that same night on the phone, but I haven't heard any more from him. As he is only in his early twenties I feel like I shuoldn't have slept with him and our chances are ruined. Should I just forget about him or should I keep in touch? Do I text first? Is this ruined?
Guys, Did we have sex too soon?
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