First lets look at preflop. What is the frequency UTG has been raising? Is $7 his standard first in raise, or is it a small raise for him? If this is his standard raise and he doesn't raise frequently then I like your call. Otherwise I put in a pot sized bet here. On the flop I don't like the check/call at all. Again it will help to know the tendencies of UTG. Will he make a continuation bet with overcards even against several callers or no? If yes then I go for a checkraise, if not then I lead out on this flop. Provided you've played the hand this passively so far I have to agree with your fold on the turn. You haven't taken any opportunity to test the buttons hand and now you are facing his bet with with a player behind you yet to act. Unless you know the button is capable of taking multiple shots at the pot with position I don't see any way you can call the turn bet.