1 month up. Help Required

Hello Guys,
Let me tell you a brief introduction. Problem statement. Expectations and a couple of questions.
I am 34 and married (8 years) and became a father when i was 31. I started PMO at a very young age and it was never a problem. My frequency was one per day. And occasional intercourse with my spouse although its been 8 years and the attraction is long gone but somehow i made it every time.

Problem : I came close to another lady 7-8 months back. i find her really attractive. I had some foreplays in the car initially and due to which i completely got rid of porn but started masturbating on new content thinking about her. The frequency rose to 2-3 per day but its MO with no porn. While the next foreplays, I noticed that i am not as hard as i should be. i didnt allow her to enter my pants. Now when i meet her, i take "sildenafil 50mg" and so far its working great for me. But that i dont want as a solution. I want a long term fix. I started NoFap challenge. After 1 month, Now when i wake up in the morning, i feel a flaccid penis. And when i think dirty about her, i notice a hard erection (which is definitely an improvement). As long as i think about her in a dirty way, the erection stays.

Expectations :
1) I expect my erections to improve with time so that i get rid of the magic pill.
2) I have seen that when i think about sex, i get a hard erection but the moment i lose the thought, the erection goes away. i would like to have a fix for that. in my opinion, the erection should stay.

Questions :
1) My only question is that will I be able to achieve my expectations (see just above). Right now i am really motivated to stop fapping for life. A healthy penis is enough motivation after all.
2) Another personal question : I have lost interest in my wife completely after having that secret affair. i feel sorry to say that as i love her. Will i be able to regain that sexual health when i could simply have intercourse with her even though i am not attracted to her anymore. I somehow was able to few months back which seems impossible right now.
3) I am also waiting for morning erections. Currently its flaccid but gets hard when i am awake and think dirty. Will that improve?