Search Results: sleeping with my best friend

I have this friend, we use to be kind of best friends. A guy Im so comfortable around I can walk around him with no make up on or hangover asf. He stayed around mine couple of times aswell. We can not talk for months and then when we do, it's not awkward and we have so much fun. I know him for like 2 years by now. My sister introduced me to him.
He was going out with my sister and he was in love with her. He did everything for her but she didn't appreciate it and was so cold to him& played with his feelings.
Now he likes me a lot. He lives miles away from me but is coming to see me no matter what. Skipping his work, college just to see me, it costs a lot aswell to come to my area. He is telling me that he loves me, changing his profile pic to a pic with me, his wallpaper is with me aswell. I do believe that he actually loves me. Too long to explain, but he does a lot for me and shows lot of effort.
But I don't love him.
I don't know how I feel about him. When I'm with him I do wanna kiss him but then I regret it. We only made out, we never slept together but if we would I wouldn't mind. Even though he slept with my older sister like 2 years ago. I just don't want anyone to know coz it's kinda strange. If he wouldn't love me and would be only after sex then I'm alright, I would join him and be friends with benefits. Just don't wanna hurt him. He has been hurt so many times in his live. He doesn't really have family and it's hard for him.
I don't mind kissing him or sleeping with him, just don't want a relationship. And he knows that.
His 18th bday is coming and I dunno what should I get him. He didn't get me anything but he made my bday the best. Everyone left me so he organised a party for me. So it's not like he didn't get me anything, he got everything for me. All the alcohol and other stuff. He just made the day. Bless him.
I'm not sure if I should get him anything. Maybe just a bottle of champagne and a card? Or something more? Or nothing? I dunno

I am sleeping with this guy I met a while, it's completely casual, and I have no problem with that ( so far) let's call him 'a', but I very recently was involved in a painful love triangle of sorts?

I had feelings for this amazing guy 'b' and I let him know, because I feel as if that's the decent thing to do! But he let me know that he actually fancied my best friend.. And while this was undoubtably awkward, I tried to be happy for her, incase she decided this was something she wanted too..
Now, the thing about me is; I get attached veeerrrry easily. B was somewhat an asshole with the whole crushing situation, he understood and respected that I had feelings for him, but let me know that was not even an option..

So I was placed in this very awkward situation with my closest friend and the guy I liked.. She eventually let him know that feelings were not reciprocated and her and I managed to patch up our friendship rather quickly.

I then joined tinder and slept with a guy I've known for years (a)
I feel as if this is somewhat out of character for me? And I am unsure whether my feelings for b still remain.

In addition to this, a was the first man I've slept with since breaking up with my ex over a year ago.. so this was not something I decided to do without lots of thought.
I'm just confused and can't process my own thoughts... advice or a response is appreciated.