What can I do if I can’t settle in a steady relationship?

I’ve been with my boyfriend 4 years. I love him and we get along so great. Before him I was in an off again on again relationship for years and while it was his choice to be unstable I enjoyed having freedom and being single every couple of months. I’d date and meet new people, have loads of friends and go out all the while I’d have someone there that I could go back to.

While I’m getting older and that life is no good for me anymore but I long for it back. Just being free. I also love having my boyfriend now so I don’t feel alone but I miss my old single adventures. The excitement and meeting new people. What can I do? I don’t want to leave my boyfriend he’s a great fit but I just find same thing constantly is boring
What can I do if I can’t settle in a steady relationship?
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