Why did your last relationship/situationship fail ?

This was back in 2017. I was in a 2 year long relationship and we had gone for a trip along with her younger sis and her bf. In the trip, her sis (younger to me by 6-7 yrs) spoke disrespectfully about/ to me in front of everyone. Later in private, I took up the diss with my gf but instead of assuring me that such a scene will never be created in future, she instead started defending her sister. I realised that with such an attitude, I will always be taken for granted by her and her family and called off our relationship not long after our trip. Yes, I may be called a shitty person for not trying more but I decided to stand for myself and my self-respect instead of being in a compromised relationship. I had quite a bit before understood our differences in values but being of young age and fresh in love thought that things will improve, always choosing to be optimistic. But that disrespect, just acted as the firestick to a fire when I knew I will need to take the call. Married 3 yrs later in 2020 with lessons from my last relationship and have an understanding partner with both of us completing each other.

It was my fault entirely. She was the best thing that ever happened to me. Least demanding, frugal with spending, understanding.
I was just used to romanticism that I see in cinemas and expected possessiveness and more talkative.

It was also during covid, we were long distanced and couldn't meet due to Lockdown. I had gotten new job that took lot of time from my day. We used to have fights and after a while, I just gave up trying in the relationship and I was with guilt that she deserved someone better, who had figured out his life and I ended it.

If I knew then what I know know about relationships, maturity etc, I would've never let her go, would've met in person, sit together, solved problems. Truth be told, I indeed was really happy (effect of oxytocin) in that relationship, just was immature then to not realise that perfect relationships don't exist and it's our duty to make it work (it's not gonna work out on it's own). And also, we don't need to be perfect in relationship, we just need love and understanding.

Arrange marriage hogaya mera

Ideological difference.

She said she's a deist during dating, and almost 5 months in, she turned extremely religious to the point she started insisting me to go to temples and do not just Puja but also Homas. As an atheist, that's my breaking point.