Once more, in case your former prof breaks up together with his gf, if things start moving along from there, great.
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But do not actively stir the pot! I’m sure you’re hoping that by simply “saying something,” you’ll set in place the program of action in which he breaks up together with his gf and begins dating you instead, right? But also putting aside A the ethics to be one other girl, B their reputation because of dating a student that is former and C the complex situation that you might unleash that isn’t likely to be completely within your control, that is seldom good footing for just about any relationship to start out on.