No one knows that i killed my dog?

Lately i am so regretting this. it's been a month since my dog died. he was really sick and due to his bad condition i was visiting the vet once everyday. he lost alot of his health and was looking really skinny in first week but later he lost his eye sight too. he was not even able to judge his feed bowl and follow the smell of food to eat it. he was suffering from seizure attack. he never ever had that before in his whole life of 12 years. I couldn't see him suffer anymore so i phoned the vet and asked for the permanent sleep procedures. he said he can do so but i need to bring my dog in and he was asking for such money which i think was unreasonably too much. so i gave my dog a overdose of his daily medicine medicated by vet for purpose of relaxing his mind. i gave him that a night before and he never woke up in the morning. i really loved my dog and i miss him, so my parents pushed me to get a new dog. i own another dog now but since i got this new dog i keep remembering him and keep regretting what i did. will i ever get over this?