I think you be open minded and see where this leads. If you aren't there a lot at this point and text a lot start sending some flirty texts and see how he responds. Try to manage to have another night out where he is there with you and amp up the flirt and see what happens. But, don't go for FWB - in my opinion. If you are interested in him...... start talking and asking him open ended questions, touch is arm or elbow occasionally when talking to him, make good eye contact and be interested in what he is saying....no matter what he is talking about, laugh at his humor. If he's interested in return you'll know. If he wants to be a buddy he'll never know you were actually flirting. Go for it w/ this guy and see what happens. If it doesn't work out like you said, you're already not there a lot.....but who knows it just might work!