Has it been more than 24 months since you got a raise? Go ask.
Take a second to do some research about what your role is paid in other orgs in your area. If you're paid noticably less, mention that.
Also organize your thoughts around the good things you've done since last raise. Did you take on new responsibility? Achieve something hard? Exceed goals? Any of that is stuff you can bring up.
Read about negotiating salary during interviews and apply those tactics.
Don't be adversarial. Your tone here is "I've considered my pay in comparison to the market and in light of performance, and I'd like your help getting my pay to reflect that"; yes, your boss is probably not on your side, but it's in your interest to act like this is a thing you'll work on together. Your boss will know you might leave, it's implied: it doesn't serve you at all to point it out