How can I stop being obsessed with My best friend and can I still remain bff's after My obsession?

[Risc]

Two years ago I met a guy (I'm a Guy myself) And From the moment that we met, we had this inseparable friendship, we really did everything together.. I never experienced a friendship like this and even tho i felt Confused at times (and questioned my feelings for him) I knew that this was something i didnt wanna lose..

After a while i noticed that he started to change, he stopped asking me to join him doing certain things, he went out with other friends without inviting me and, stopped messaging me every day by text, didnt tell me things that happened in his life anymore and other things like not liking My facebook and instagram uploads.. Things that were golden rules in our friendship at One point..

(He still calls me his best friend)

Anyways after Good thinking I realised that This situation made me obsessed over him.. For example:

I made a fake instagram Where I only follow him so I can keep track of everything he does and every pic he likes.. And if he doesnt like My picture it makes me Feel like shit

I check his whatsapp time status (text based chatprogram) to see if hes using his phone..

I check his facebook to see what hes doing.. If he write a text on fb, i Google it..

If I hang out with him thn I analyse every word he says..

I hate every person he talks to.. And starts fights with them..

I dont want to do things that dont involve him.. Like going out, hanging with friends etc..

At his birthday i bought him a gucci bag..

I start fights with every little thing he does wrong..

I can go on for hours but this are The main things that made me realize how obsessed I am about him..

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Ok so My question is how can I stop this without losing My friend completly