Sprite flipping conflicts with movement

So, I'm trying to get my player sprite to flip along the x-axis according to which side the mouse is (i.e. if the mouse cursor is to the right, the player faces right). My code for this is: public Rigidbody2D rb; public SpriteRenderer sr; public GameObject go; private void Start() { rb = GetComponent<Rigidbody2D>(); sr = GetComponent<SpriteRenderer>(); go = GetComponent<GameObject>(); } if(Input.mousePosition.x > go.transform.position.x) { sr.flipX = false; } else if (Input.mousePosition.x < go.transform.position.x) { sr.flipX = true; } Now, this code conflicts with my movement script, which is: void FixedUpdate () { if (Y > -7.0f) { grounded = true; } if (X > 0.0f) { X -= 0.5f; } if (X < 0.0f) { X += 0.5f; } if (Y > -7.0f) { Y -= 0.7f; } if (Input.GetKey("a")) { X = -7.0f; } if (Input.GetKey("d")) { X = 7.0f; } if (Input.GetKeyDown(KeyCode.Space)) { if(canJump == true && grounded == true) { Y = 11.0f; Debug.Log("jump"); } }rb.velocity = new Vector2(x: X, y: Y); } private void OnCollisionEnter2D(Collision2D collision) { canJump = true; } private void OnCollisionExit2D(Collision2D collision) { canJump = false; } } Note that the movement code works fine on its own, but when I added the sprite flipping code it magically stops working. Could anyone tell me why this happens and/or give me an alternative method to do this?