Hi all,
Usually I use the rule where money starts - friendship ends but one friend of mine knows that im doing short term trading and today he offer his money not a big amount but it not all that matters, even though I said I don't want to risk not my own money, and informed him about biggest risk etc, he's still ok with all that.
I made a decent profit but we all know how easy you can loose a decent amount fast too and Im not the one who's looking for more worries in my life lol ( f that, have too much already )

Should I accept it? What would you do?
You face two problems in trading with funds of your friend. The first was described by you detailed and comprehensibly. This alone would be for me a reason not to trade with funds of someone else.
The second aspect, the more important aspect is following:
Do you trade his funds on his or your account? If you trade funds of someone else with your data, then you could maybe be responsible for taxes. I would never trade for someone else as private person. All what I do is, teach friends the basics and let them collect their own experiences.