Should I go to Europe with my boyfriend? ?

Going on a trip like that is a great way to find out how compatible you really are, because you depend on each other and get to see how the other reacts to unforeseen circumstances. I highly recommend it.

For us it was a hiking trip to Ireland about 5-6 months after we met. Just the two of us and a tent, I think we spent 5 days on that trail before we even got to the next village.

Fun times, one of those days we didn't leave our tent, but it was also learning to work together, having to hurry to get off a mountain before bad weather reached us, midges driving us crazy and one case of hypothermia. And we handled it all together, taking care of each other. That trip confirmed for us that we wanted to spend the rest of our lives together. We've been married for 16 years now and have two kids. 

Of course it could have gone differently. We could have found out on that trip that we couldn't depend on each other, or that we were just too different, or that one of us had anger issues. But that still would have been a good thing. Best to find out things like that early in the relationship, when it's still relatively simple to untangle your lives. 

What's the difference between Hawaii and Europe? One is just further away.

If you had only been together a month I'd say it's a bit too soon. Since it's been 8 months and you've already traveled to Hawaii with him I think you should go to Europe. It would be a great, fun experience for you both.

On the offchance things do go wrong, make sure you have enough money to fly home on your own. Be smart and be safe and you should be just fine.

I did the exact same thing. I had a great time. I'm not sure why you wouldn't go, what are you afraid of?