I am so incredibly sorry for your lose! I just lost my boy because he jumped and I feel horrible because I was getting ready to move him into a 5 gallon tank :( But I think he was ready to go because I kept his lid on tight and I cannot figure out how he jumped for the life of me!
Now I have to say this and I'm not being cruel at all. But your boy was very special I can tell, trust me I lost my first guy from lack of care and I haven't forgiven myself for it! But you must realize how selfish you are for saying you're giving up on them. I know how hard it is to loose a loved one, I have lost more than I want to count and it haunts me but those memories keep me going and help me continue to save all animals.
If you give up on them now all that love you have for him will be for nothing. He wouldn't want you giving up on his fellows, he would want you to continue to rescue as many as you can and show them the love you had for him. Imagine all of the bettas who will be without a home if you aren't there to help? The world is full of people who know nothing and care nothing about fish. Trust me I was clueless a year ago (still am but learning more and more) and now I'm getting ready to take on a new female (I just lost two from a strong flesh eating disease, I bought them knowing very well that they were sick, and within two days they were both in heaven. I had to throw away my tank and everything with it and trust me I was heart broken to lose both of them :( BUT my dream is to build a sorority tank of rescued females and I am going to do exactly that because I know that if I don't they may never find homes).
The bottom line is do NOT give up because you're giving up on all the bettas and every other fish that needs a home. Without you, we, the people who care for fish, will lose a valuable member and the fish will lose a great home and a someone with a lot of love to give.
A few years ago I was driving home and I was texting a picture of my friends horse to her when all of a sudden I saw a bird, she was jumping up to fly away just as I was coming and BAM I hit her. I was on a busy exit but I hit my brakes parked in the middle and ran to get her. She had survived the impact and I grabbed her before the major trucks came. On the way to the car she struggled to get out of my hand and then slowly closed her eyes and flew away to heaven. I could only sit there in the middle of a busy exit right off the HWY and cry. I brought her home and buried her. I am now dedicating my life to saving animals (ever since I could talk I have always wanted to be a vet and I'm finally going after my dream!). My point is, I've hurt animals and have had to live with the guild of it all. But I know that giving up with be an insult to them. I am not trying to be mean but I know when you just want to give up, trust me I lost my boy and then those two girls all in one week. The girls were almost expected because of their disease but my boy jumped and died that way. I will continue to keep bettas because I know that someone needs to show them the right way.
Please do not give up, you have got to keep on moving forward. Think about all the betas that need your help, don't give up on them!
My dream is to educate the world about animals and show them that they are just as important as us
5 gallon with Socrates
20 gallon long with 2 new boys (divided)
10 gallon with Ariel
2.5 with Maximus