Really bad neck pain, tightness?!

When you have the flu you tend to spend more time in bed. Anytime you are in that position you blood circulation slows and your muscles can give you pain because of lack of usage. All of your symptoms are clear signs of the flu. Start with Tylenol for pain and headaches. and see how you feel. If you tolerate that and still have pain then try an Ibuprofen with plenty of food. No your boyfriend did not give you meningitis. If you were infected it would have been before he got that shot. Drink plenty of water.

Nursing Degree

With fever and headache, there is a possibility of meningitis. Meningitis may cause intense spasms of the neck muscles and make the neck very stiff. More commonly, though, neck pain is part of a flu syndrome that includes fever, muscle aches, and a headache. When generalized aching throughout the muscles is present, a visit to a doctor is seldom useful. When a stiff neck is due to one of the more common causes of muscle spasm, the sufferer can usually touch the chin to the chest, though perhaps with difficulty. If in doubt, it is better to see the doctor for an ordinary muscle spasm than to attempt to treat meningitis at home.

Warmth may be of benefit in relieving spasms and pain. Heat may be applied with hot showers, hot compresses, or a heating pad. Heat may be used as often as practical, but don't burn the skin. Aspirin, ibuprofen, or naproxen will help relieve pain and inflammation.
Neck pain, like back pain, is slow to improve and may take several weeks to completely resolve. If pain doesn't lessen in a week, call the doctor.
I hope this helps you. And good luck.