No porn but I have a strong sexual desire problem.

So I have a problem where I have already quit porn but still have a problem with masturbation. I hadn’t had a girlfriend in quite a while because of school, but the effects of loneliness are still with me, which usually leads to doing the deed. Recently, however, I started focusing on strengthening my relationship with god, and when I found this app, it helped with my masturbation problem. On Day 3, however, I came close to relapsing. I woke up this morning half asleep thinking of this girl I matched with a while ago when I tried dating apps (because I wanted to try and see if I could work on school but still have a relationship). We texted, called, and FaceTimed almost every day. She was very flirty and ended up coming on to me….hard and sending me some photos, and we started sexting. Unfortunately (or maybe fortunately), it didn't go as far as that because she lived a bit away, and I was so focused on school that we ended the relationship My problem is that I still think about what would have happened if we had gone all the way. I can't seem to get that out of my head, and the feeling is stronger in the morning when I wake up. I had a few close calls and kept telling myself to “move on from this because it will never happen.” Idk I feel if I can get over her somehow, I can get through my sobriety easily. Any advice?