It could be

In my case it was I ended up getting hurt so I try not to fall in love quick but it’s hard sometimes not to but when I do I usually end up getting hurt and makes me feel like I’m never going to find the right girl and be happy

Not necessarily

Yes.

It can be if you fall too hard.

Sometimes, especially when you don't fully know the person you are falling in love with.

It depends ...
how quick you talking about?

Not at all

No

What starts fast, ends fast.
Take your time.