Based on the facts narrated by you, there appear to be two distinct aspects requiring consideration: first, whether the conduct of your husband may constitute a legally sustainable ground for divorce; and second, how your financial interests, particularly in the Dwarka property, can be protected before you take any final decision regarding the marriage.
As regards the matrimonial aspect, Indian courts recognize that direct proof of adultery is often difficult to obtain and therefore permit parties to rely upon circumstantial evidence. Repeated secret meetings, unexplained association with a particular person, concealment of communications, contradictory explanations, and conduct causing mental anguish may collectively be relevant circumstances. However, suspicion alone, however strong, is generally not sufficient to conclusively establish adultery. On the facts stated by you, the more immediately sustainable ground may be mental cruelty arising from years of alleged dishonesty, evasive conduct, unexplained interactions, refusal to provide reasonable explanations, repeated breach of assurances, and the emotional distress caused thereby. The incidents involving the cheque, visit to the colleague's residence, the resume found in emails, the Kindle allegedly belonging to the same individual, and the use of her phone number in a medical record may all be circumstances capable of being placed before a Family Court as part of a larger pattern of conduct.
From a financial perspective, the Dwarka property appears to be the most significant asset. You have stated that the property is jointly owned, the home loan is in both names, but the entire down payment and all EMIs have been paid by you. In such a situation, the title documents, loan records, bank statements, and proof of payments become extremely important. While ownership recorded in the title documents carries considerable weight, courts may also examine the source of funds when disputes arise between spouses regarding beneficial interests. Therefore, before taking any legal step, you should collect and preserve all records relating to the purchase of the property, including the sale deed, loan documents, sanction letters, bank statements reflecting the down payment, EMI payments, and any communications relating to the purchase.
Since your daughter is now 18 years old, custody is no longer likely to be a contentious issue, although educational expenses and support may still arise depending upon the circumstances. Your immediate concern appears to be financial security following your recent loss of employment. In these circumstances, it may be prudent to first obtain a complete understanding of all matrimonial assets, liabilities, investments, insurance policies, retirement benefits, and income sources before deciding whether to pursue divorce, judicial separation, or a negotiated settlement.
If you are contemplating separation, I would strongly recommend that you do not make any hasty decisions regarding the jointly owned property until a comprehensive legal and financial strategy is prepared. Depending upon the evidence available, you may have claims relating to your contribution towards acquisition of the property and may also be entitled to seek appropriate financial reliefs. Conversely, if an amicable settlement is possible, a carefully structured settlement agreement addressing property rights, financial arrangements, and future claims may avoid prolonged litigation.
In summary, the facts narrated by you may potentially support a case based on mental cruelty and, depending upon the available evidence, allegations relating to an extramarital relationship. However, before initiating proceedings, your priority should be to secure and organize all financial records relating to the Dwarka property and other assets, assess your post-employment financial position, and obtain a detailed legal evaluation of your property and matrimonial rights. This will place you in a significantly stronger position to make an informed decision regarding the future of the marriage.