think your pushing anything (air?) just from villains actions. Villain looks to be on a flush draw or a pocket pair with a flush draw. At the river, villain puts you on similar hand. Based on the way you say he has played to this point and the fact that you state you have been "fairly active", villain calls with minimum TPTK, if he has been playing an under pair with a diamond (which looks possible), then he is a total donk to make this river call. Depending on your "fairly active" previous plays, villain may have even slow played the river also, knowing you would bet out.