Boyfriend dilemna help!!!!!!..guy drama,depressed and in need of medical help ...ughh?

soo here is the deal.Me and my bf have been together for 4 yrs,This past year our relationship hs been hard on and off and on and off.It's been really hard for us.Now latelty it's been different day by day we have been repairing and working on our relationshi[ things have been getting better.I love him alot,and care bout my bf,and support him 100 percent.The thing is I can;t stop thinking bout him..While me and my bf were on break,I meet somebody I made friends with and things well here is the story.I meet this person from one of my really good friends,we knew each other back in h.s. we meet three times,back then I was fat so things were different.Since then things changed,now I got slim toned and takes care of myself,so meet in march of this yr.I taught of him as just a friend.We chilled talked,he friend request me on fb I accept we talked on fb chat,and then it led to texts and phone calls 24/7 falling asleep on the phone,I see him as just a friend but then I started to realize why does he do these things call me,text me,hang out with me,take for long walks,go to the park look at random stuff ect ect.All my friends would tell me he likes you janet,and I would be like no no.IBut then I feel for him,I grew attacthed I started seeing him more and more,he made me realize soo many things,a couple of months ago I would never like a guy like him,But he made me realize looks arent everything ,let's put it this way my bf is expectionally good looking tall handsome white boy looks like he could be in a cover of gq if he could,whereas the other boy is just a short chinese boy not the best looking but has mad swag,artsy,raps,tags,skateboard,and spins at parties.By the way the boy is 19 I am 20 and my bf is 23.Me and him stopped talking,I decided to just dead him,cause I realized he's nothing more of a manipulator,a dog and just used me for his instant gratifications and making his fantasy of hooking up with "hot latina" come true.I told him this last time we spoke he told me I am ****** up **** u and you could never ever understand how I feel,in my heart blah blah.Now we don;t talk,I don't want to talk to him,but I do miss him terribly,I felt for him,he always crosses my mind,the most vivid memory is that we had on coney island beach this was in may we laid together under the sand,we were listening to kid cudi and we held hands and kissed for so long.We stopped talking becuase of a major issues that happend three weeks ago,which consinted of me blacking out,him dropping me ect ect.I can't stop thinking bout him, I still remember the raps he would rap to me,or the things he would tell me in my ear,I hate it I just want to stopped thinking bout him.I still remember last time we spoke was last week he called me I did not want to talk and we did for a bit,he said he missed me soo much and this and that but I do not believe him one bit. I hate the fact we became friends in the first place.It sucks.And now me and my bf are going out again we are no longer on a break this occured while me and him were on a break.So it's like ugh.I just wish I can stop thinking bout him and it makes me more mad is that I know the other guy I prbly don't even cross his mind,He prbly is laughing at me.I can't take it.That's why I deleted him of my fb aim and deleted his number I tried to stay as far away as possible.Ugh...on top of that I am depressed,I keep eating and I am letting myself go,and everytime I hang out with my bf all I do is pass out and knock out and sleep,I don't have the energy to work out no more nor the ambition.I really love my bf,but I am depressed I eat,and then today I purged,I feel fat and ugly.On top of that I had my period twice this may,the second one in may my period lasted for 9 days and then a week later I had it again this june,and it was all tint brown light blood for 5 days and no red blood and lots of cramping and swollen boobs I think there's something wrong insdie me,I hate how I feel now,I feel like ****,my motivation and energy to workout is gone.And it's even worse last night my bf was like looking at himself in the mirror ans is like I look soo good now damn my skin is glowing and he looks at me,and he's like you look fine.I turned around and started to cry...ughh ughh when will I feel happy again?