Oh My God! Losing your best friend is like hell and nothing can be worse than this. Although love is impeccable and unconditional, it hurts more when your best friend breaks up with you for any reason. Friends are the biggest supports in life and they are always there for us no matter what. It doesn’t apply to a lover.
We should never take our friends for granted as they are the one who handles our melodramas and even our mood swings. They always stand with us for pampering and providing a comfort zone at the most vulnerable time because everyone else leaves our hand at some point of time in our life. According to me, there is no relation in this world which can provide that level of comfort. Last but not least, friendship has no boundaries and you can do whatever you want to do without any restrictions.
While in the case of lovers, you may need to be disciplined and maintain your boundaries a single careless move can destroy your happy going love-life. You can’t share each and everything with your partner as there will be some dark secrets which you never want to share with him/her, unlike your best friend. Yes, breaking up with your lover also sucks but you can recover from that.
Now, think for a while what if that friend leaves your hand when you need them the most? I know you don’t want to imagine that dejection.
P.S. Don’t get offended with my answer as it is my personal opinion and it may differ from your facts and figures. Also, this is a very sensitive topic and this argument will never end.