I just got back from Medellín on Saturday from an eight-day trip. It was my first time in Colombia. I had an amazing trip and never felt unsafe. I will admit that I planned a trip back in April, but then canceled because I read too many Facebook sorry stories about crime. Obviously it's terrible whenever something bad happens to anyone. Like others have noted, common sense and trusting your instincts will go a long way. I don't drink, use other chemicals, and I don't party. I wore an Apple Watch and used my phone occasionally on the street, but I wasn't obnoxious about it.
I met up with many guys, mostly from Grindr and mileroticos. They were all very attractive and I had a great time. I did my best to vet them, and make sure they had social media, twitter, an onlyfans, etc. My sense is that many were interested in ongoing financial support, either directly or through through their websites. To be blunt, if they kill you they might get what's in your wallet that day, but nothing in the future.
I think the best advice I can give you is to spend time with the local guys, and they will look out for you. The local job market is really tough and there are many guys on Grindr who are unemployed and bored. I was very interested in seeing the sites around town, like Comuna 13, museums, Pueblito Paisa, parks, and Guatepe. I met up with two guys in particular and offered to buy them lunch and pay for travel expenses. Both were happy to take me around town and were very proud of their city and its culture. One even took me up to Mirador Picacho in the evening to see some breathtaking views of the city at night. I was a bit apprehensive but it was worth it. The trip to Guatepe was also worth the two hour Uber drive!
I'm already planning my next trip back. There are many more things I want to see and guys I just didn't have time to meet up with!