is taking an break a good idea

Lately I've been very sad and i don't know who to ask for advice so i decided to ask here

My girlfriend doesn't love me as much anymore she told me. we've been going out for almost 4 yrs and the thought of losing her completely terrorises me.

she hardly returned my calls last week so i decided to stop calling or texting her. she hasnt been online either. It's been 4days now since we spoke
so its like we're going through a break but without actually deciding to do it.

Im wondering if this is a good idea or will it just make her see that she doesnt need me or something because i
checked her facebook and she uploaded loads of pics from friday she looks happier as ever.

I dont know if i should phone her and suck up and try make her happy and shit or will that just look pathetic
since she even told me she doesnt love me as much and obviously we both know shes not returning my phone calls.