Can you solve this riddle? ASAP?

[Me.]

love

two people can be one person
but one person can't have enough love for themselves
and three is cheating D:

 

[Fallon H]

Two can be One
but One cannot be Two
and Three can never be
what am i?

a friend texted it and i want to know the answer!!
1st to tell me gets best answer

 

[Lynsey R]

a twin ,
2 of them known as one.
1 on its own isn't a set.
and 3 would make it triplets.:L

i dunno , just a guess

 

[Lewis]

I think its one because i is one and that can not be two and three cant be so its either one or a trick question

 

[Earthlover]

I think it is 6.Because I added 2+1+3=6.

 

[sheritol]

idk, can i guess? spouses? idk, lets go with that.