i think i have quite an experience with this issue. since i got away from the hardcore behaviours and more and more into recovery i have told many people about my ed and my recovery. at first, i would say "i had an eating disorder" probably also to force it upon myself that it had gone. of course i kept relapsing and then i started to tell people because opening up to certain close friends can help overcome that feeling of ambivalence and of leading two lives. and of course, they might support you in many ways. i also told some people just so that my weirdness around food that comes up from time to time doesnt lead to false asumptions but that i come clean by simply saying "yes i had issues with food and i have come a long way now".
ok. your questrion of course was different but i think it helps hugely if you understand WHY you are telling certain things to certain people.
i can talk to my boyfriend about everything. about the stuff i think about my body and about the things that i think about myself and the things that trigger me. but this came about quite slowly (we ve been together nearly 2 years now). and mind you, i dont throw the "ed-vocabulary" (trigger, feeling fat, compentsate, purge etc) at him just like that. i circumscribe them and this helps me a lot to understand why it is that i feel so fat for example. i dont simply go and say "wow i feel fat today" and thats it. becasue as we know its not about the food and the fatness etc. the other day i was struggling and feeling bad and i was ill and i was pushing him away and when he asked me what what was going on i thought for a while and told him "im comparing myself to others all the time. i think somewhere inside there is the notion that im not worth anything. thats why i try to compensate all that with my looks with my grades with by ambition in sprots with other things that have some kind of worth in the society or in my world view. and now that im ill i cant do sports and i cant concentrate on uni etc. thats terribe and i feel -triggered- in this way to compulsorily compare me to others."
ok, so what i want to say with this long and personal storry is: try to get the context. if you care that a certain friend or family member really understands you, be patient and put things into context. start from the not-so-irrational facts that everybody is percieving and follow through to your chain of thoughts and dont forget the feelings that you are feeling. i think my boyfriend cant understand my logic many times but he gets it when i say i feel really pressured or sad or whatever because of this and that which is causing me to be confronted with this or that feeling inside of me. i hope you understand what i mean to say!!!!
and also to mention it: some people just cant really understand what you are going though even if they want to, they misunderstand and misinterprete. you will have to deal with this bit. i find it quite uncomfortable with relatives who i dont see that often and then they are all surprised seeing me eat a full portion or unconvienently mention "wow, i cant remember the last time youve eaten my chistmascookies!". or going out with friends who have some kind of weird body image themselves (but no ed) and the situation gets all awkward when they order the light salad and i order a normal meal. well... those are things that you cant avoid even if you tell everybody about your struggles. and sometimes, telling everybody also provokes these situations.
i still have to say congratulations for telling your friends, that is a huge step! and to summarize all of this (sorry it got so long) : its great you told your friends, my advice to you is to put things into context when you want to go deeper and make them understand but you dont have to. its also ok if you stay like that, or wait until they ask more.