Relationships fail for many various reasons and I’ll be touching on one aspect which is mutual respect. When I mention ‘relationships’ I’m referring to mainly your family, friends, and partners.
In these relationships you are supposed to feel the most secure and safe because these are the people we couldn't choose and those we did choose to be surrounded by. So I don’t think you should be even thinking of having your guard up. But you should, and if you already do, then its probably due to a lack of respect out of maybe other aspects.
The thing is that, you may have missed the signs of the disrespect for a while just because you simply didn’t expect it so you would keep assuming it’s nothing. Which is where we go wrong because we are not in the position to be ‘assumers’ and we should really start addressing these things in a timely manner in our relationships.
I’m not completely for the ‘scissors - I’ll cut you off in a heartbeat gang’. Definitely value your relationships unless it is clear that it’ll only diminish you; if not, then yess - have difficult conversations and move on. But, this combo will be sustained by mutual respect amongst other things because we cannot continue to disrespect people/receive disrespect. It's unhealthy.