Why Worry?

I've been fooling around with this guy and I know for a fact I don't have anything. Or had... I should say.
And I don't really want anything either. So long story short, we're fooling around and about to have sex, but I wasn't letting him, or going through with it. Whatever you want to call it. Description: We were right there and he's partially in but we stopped. And just sort of rubbed our parts but the outside, kind of in that deciding stage. But he had pre-ejaculation at times. I just remember him telling me to stop so he could move it, so I mean it was outside - that's basically waht I'm getting at. He pre-came on the outside, or not 'inside' of me.

So waht am I at risk for? He hasn't gotten checked but he says the last girl he's been with was months ago. ... but I know anyone puts you at risk.
And, as for HIV and herpes, and HPV and waht not. I mean, okay if it's curable that's fine. I'll go get checked and will fix it. But i'm more concerned about what I can't help.

Advice? Or am I pretty much okay?