They are just avoiding the situation,
This is what you assume.
Without trying to confirm with some investigation,
You declare that they made an excuse.
In some cases, it may be true
But that excuse may be hiding some major issue.
Try to ask, maybe, they are in a actual problem.
You can give a hand as they try to solve them.
They may have a problem with the situation
Or trying to hide one that exists between both of you.
If you don’t ask, how can you be so certain
That this possibility can never be true?
Don’t guilt- trip yourself, just check once.
Whatever the problem (if any), try to find a solution.
You can’t be stuck and hanging in between.
Excuse yourself and try to become better if that is what you need.