If this is a person that you are attracted to, feeling comfortable around them should naturally make you even more inclined to want to date them.
You will have to do some introspection.
You should examine how you have been feeling about this person from the start.
If you were truly attracted to this person from the start, feeling comfortable around them should add to your willingness to date them.
This typically means that you experienced a degree of chemistry with them.
There has to be a level of romantic interest on your part to begin with.
You would know if you were truly attracted to this person by how they made you feel upon initially meeting them.
Where people often get confused is when they misrepresent how they felt.
They may tell themselves that they were attracted to the person when they really weren’t.
There was most likely something about the person that caught their attention at first.
It could have been a particular physical feature or a character trait.
They were drawn to this and told themselves that they must be attracted to this person.
However, they later discover upon further interaction with this person that the attraction is no longer there.
They have now gotten comfortable with this person but feel no romantic spark.
This does happen.
Your task is to figure out where you stand.
Did you feel some attraction to this person from the start?
Is that attraction still there?
If the attraction is no longer there, you may feel like this person is undateable.
This is where you really have to be honest with yourself about how you truly feel.
Some people go on too many unnecessary dates even when they know that they are merely comfortable with this person and not romantically interested.
You will need to ascertain whether what you are feeling is real interest for romance or merely platonic.
One of the best ways to do this is to ask yourself whether you can visualize a future with this person.
In other words, can you see yourself in a romantic relationship with this person in the future?
Do you believe that you will have their hopes, dreams and ambitions in mind and hold them dear as if they were your own?
Do you even care for or know what their hopes and dreams are?
When you can ask yourself these questions and answer them honestly, you will know how to interpret what you truly feel.
Sometimes being too comfortable with someone may make a person feel like they have been overexposed.
This person may feel like the other knows too much about them and too soon.
This may make them uneasy and believe that the other is undateable.
This may be the kind of person that believes that maintaining some mystery in a relationship is what helps to keep it interesting.
They may feel that being too comfortable with someone has taken out that mystery and made their relationship too predictable.
They consequently decide that this other person is undateable.
This may be what you are experiencing as well.