Sorry cause I'm writing this on mobile format.

So a little back story here, I've been having a 'thing' with this guy, I'll refer to him as J, we met in a town in north west Australia and we are both backpackers. We ended up in a hostel romance and feelings on my end got pretty Intense, however he ended up going back to the UK after a couple months. 

We kept in contact while he was away and in December last year J came back to Australia. We ended up meeting up in Perth and had a hotel together for a couple nights. 

Over the next couple of weeks we met up tonnes and were sleeping together etc. However, it was very much an emotional rollercoaster with me wanting to have something more and J not knowing if he wanted to be exclusive or if he had any feelings for me. I should also mention we have or had an amazing friendship, with both of us connecting so fucking well with each other! 

In the end we both agreed that it wasn't fair on me for us to be exclusive because the emotions were so one sided with me pretty much having fallen in love a bit with J and him just not feeling anything. Fair enough y'know? I asked J if he'd refrain from hooking up with anyone (unfair for me to ask? Im a super fucking emotional being) and he promised he wouldn't because he didn't want to hurt me and that wasn't how he rolled anyway.

 All is well and on Friday we went out to a rave and got super fucked up as you do at a rave. He ended up coming back to my hostel afterwards where we slept together a couple times, it was real Intimate too.

Anyway, this week I found out that he had made out with some 19 year old girl,that he works with, a couple days before we slept together on Friday. Pretty much the same day or day after I asked him not to get with anyone purely cause of how I felt towards him. 

I went off majorly at him and feel super betrayed. I have lost all trust in him because of it and don't know if I should cut J out my life or just take a break and sort my emotions before forgiving him. He is one of my best friends too which hurts even more. AITA here or was I justified to go off at him? 

TL;DR 

Had a thing with a guy, might have fallen in love with him. He knew how I felt then kissed someone else then slept with me a couple days later. Didn't find out till 3 days after sleeping with him that he'd made out with someone else. Went fucking ape shit at him. Now I can't trust him but I want to have him in my life as a friend.