very funny

well, the best way to screw up a relationship would be to cheat on that person lol. plain and simple. If you guys don't have good communication skills, or hide stuff from each other. Yah that's not good. No lying, cheating, or abusing boyfriends. They are a def no no!

I'm so glad i have Jeremy

-cheating
-saying something then not do it
-ignore
-flirt with other girls

....Instead of this why don't you ask what's the best way to keep realtionships goin.
Why do you want to know the worst way to ruin a relationship?
Anyway, abuse, lying and ignorance will be bad enough.

You mean dying?

Uh.. Lying or being argumentative and critical to everything they say. Does that make sense?

As most said, cheating is a sure way to blow a relationship. >D

being shy and awkwards around them

be really possesive
be really crude
be really sarcastic
order them around,
treat them like slaves
pick on them,
every single aspect.
make them think theyre not worthy
bitch bout them
despise them.

seriously, be a total
BITCHSLUT
[newword?]

I'd say cheating on them, I don't see the point of it. If you want to be with someone else then just break up with the person, don't fool them like that.

because this is to help on what to avoid in a reltionship

more likely cheating.....

cheating.