Assuming there are no teeth problems.
Do you have a roundpen or a small arena/fenced in area? If so, I would suggest practicing there.
If he tries to bolt before you can put the bridle on, send him out and make him work. After a few rounds, bring him back in and try again. If he bolts again, make him work. Do this until he allows you to put the bridle on. Leave it on for a moment, take it off, praise, then try putting it back on. Repeat above steps until he stands quietly at any time for you to bridle him.
Someone else may have a better idea, but that's what I did with mine when he started to try avoiding me.