My parents say I will be the reason why they would end up being apart in the future. If so, then why? Don't they love each other? isn't that why they got married?

If I understand the question, your parents are saying that you would be the reason why they would break up in the future. You can take this as a sign if you're being unruly, unmanageable, etc., to stop so they can quit fighting over your behavior. Or, you could look at it as your parents don't want to resolve their own issues so they are blaming you if they were to break up.

So, you need to figure out if you are doing something that is causing them to fight and how to fix that. Own up to your part in this. If they are squabbling amongst themselves and are trying to drag you in the middle of it - don't get involved. Hope this helps.

I hate when Parents have to sloop down so low to blame the kids for their marital woes as its never the kids faults. They need to take responsibility for their own shortcomings here.  You didn't destroy your marriage at all, the test of time probably took its toll here so don't believe your mom when she tells you this but don't tell her I told you this.