1. You have no grounds for seeking divorce at all is my view.
2. You should speak equally of your love interest’s encumbrance also in your query. You told your story what about his wife’s issues like is she interested in divorce too or what are her traits like which makes this man incline towards you? Can he afford divorce if his wife asks alimony or keeps their child with her? All these major road blocks are missing in your query or decision making other than stating love is in air!
3. Being selfish, self centered and not able to satisfy physically in a 20 years old marriage are no grounds and such petitions are thrown out by Courts. Cougar woman like younger men when she is inching menopause age which is understandable in reference to context but grounds as per Law should be there for seeking divorce.
4. Ideally you should talk to your husband and beg for Mutual Consent Divorce with zero alimony and allow your husband to keep child. Reason being this love interest will take care of you ‘needs’ after your mutual consent divorce once you both re-marry and try having child of your own from this young man after re-marriage if ever it happens. So far as this man is concerned once we know what his encumbrances are one can guide similarly for him as your query is centered on different pillar.
5. In nutshell presented brief of yours are not that rosy when tested with points of Law as it is wishful thinking based probably spoiling another married woman's matrimony?
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Start searching for an advocate found via reference if you are inching towards parting company and so do advise your love interest also to search for an advocate which he finds via reference or invite him to LCI as both of you need respective advocates very soon. Also daily pray that such extra marital affairs of yours donot come out to the knowledge of society both you and your love interest keeps.
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Also investigate in internet about monogamous swingers’ lifestyle since being housewife you may get some personal time-space, where in; your love interest may introduce his young wife to your husband and herein he being young is already into you so ethically some sort of successful monogamous swingers’ lifestyle emerges which is in thing in metros instead of thinking of double divorce.