Depends on the nature of the jealousy.
I like it when my SO wants my romantic love all to herself, in moderation. I like an intimate relationship where most or all of the romance is between the two of us.
When my SO is suspecting me of infidelity with no good reason, wanting to know where I am at all times, questioning and cross-examining me, and wanting to punch out girls that look my way, I’ve been in that relationship and hated it, and won’t accept that again. What I actually did in that case, was put up with it and resent it, and after a very long time, leave. Yuck. What I would do now is talk about it, talk about my past feelings, try to come to a new agreement, explain what would and would not work for me, and see if that gets respected. If it isn’t, then it isn’t the relationship I want, so I’d explain that and leave.