Help!

Okay so there are these two guys, Tyler and Trent. Tyler I've known since I was like four. We grew up together and we are like best friends. And he's been trying to make some moves but I'm really scared that's going to ruin our friendship. Now Trent on the other hand I just recently met him and we started dating, but I'm really not into him. But his sister that was 26 years old recently died of cancer, so if I break up with him I really don't want him to feel that bad. I never see him anymore anyway. I moved away from my hometown about a year-and-a-half ago so I never see Tyler anymore, we just basically talk over Snapchat and texting. I really do have feelings for him but I don't want to ruin our friendship. Please help