Thanks for reaching out for help. It must be quite tough to deal with that feeling of being neglected or left out. However, any interaction to understand a person better and assess if marriage is on the cards needs to be built on trust, time and support. If you feel he hasn't given that to you, it was a good decision to end it there. To deal with the sense of regret you are feeling, ask yourself if you want to go back to him after his seemingly uncaring attitude. Will you be able to take more of the same behavior?
Next Steps
If you wish to get more clarity on this, take an online appointment with me or any counselling psychologist of your choice to have professional help to deal with this.
Health Tips
Any feeling of regret happens because we tend to think that something that happened in the past was done in haste or due to helplessness. In your case, it was neither, rather it was because you wanted to be given the time and respect you deserved. That should not leave you with regret. Tell yourself that it was not a fault. Instead it was an informed decision.