It depends whether you're talking about romantic love or other forms of love. Past love can hurt, agreed, but I think sometimes it's how we see it. Sometimes we want to live in that golden time and have unrealistic expectations about it.
Sure, we dont want to be hurt,, but my point was that it's very much part of life's inevitability. Everyone gets hurt and everyone grieves - it's impossible to go through life without it, just as it's impossible to go through life without love, and that's what makes us human.