is it a bad thing to stay in love with someone who left you?

I dont believe love ever dies, but you need to be able to move forward before it turns into hate. Its unhealthy to harbor on those emotions.

No because the feeling of live for someone does not disappear for someone just like that you learn to live without having to love them and them to love you back

I'd say not totally a bad thing but i would strongly recommend you to stay careful and to not give your full trust

It depends on how long you are staying in love with, and the reasons why they left you. If there was a need for growth in that relationship where you had to spend time apart, then i'd say no. It would all be circumstantial.

I’m going through something similar. He always wanted the best for me but I wasn’t open enough to reciprocate so much trust. I’ve learned not to idolise him in retrospect and that it was not our time to be together. It’s been a year now and I still love him for who he was to me but I know to love myself just as much; that includes reminiscing only in a healthy way and not losing myself or future to the absence of him.

It depends on how much you two loved each other or how much you loved them. But after you had enough time to not get passed them but to find another person, you have moved on. And thats all that matters at the time.

No it isn’t, because we can’t say no to our feelings or control them suddenly..but we can do everything to make these feelings disappear or to be less

Everyone needs time to mourn loss; which believe it or not a break up is. This person has most likely been a huge part of your life when you were together and now they're suddenly not. It takes time for your body to process what happened and it's important to let yourself do that too. For some it might take only a week and for others it can take years. Don't be afraid to feel a certain way, there's a reason you are.

Not at all. it's normal to stay in love with the person that left you, it just takes time to move on.

No, you can still love someone, love is not selfish, but never let it hurt you again for the same reason, when its gone, its gone. Never accept someone to come again and leave you again.