Help, please?

Hi guys, I really need some advice.

In January I went on a date with a guy I know from College, and you know it was nice. But I did not seem him as anything more than a friend, so I told him. We argued and it was awkward, but we got over it and now we are great friends, which I appreciate.

Well I know this guy from College, and I have been attracted to him for a while now, and I liked his profile picture on Facebook because I thought it was really nice. Said guy pops up on chat and I nearly die! He's super lovely and he liked my picture today, and I can feel myself liking him more and more.

However said guy is very good friends with the guy who I went on a date with, and that guy still likes me. So I feel like the worst person in the world

So what do I do?

Do I continue talking to this new guy, or leave it, I don't want to hurt my friend.

Thanks <3