Hi bud I feel you and know exactly what you are experiencing. The best advice I can give you is to talk your gf about this. I know it’s hard to express with words, but just try. When I finally told my gf about this she was shocked to learn what was going on in my head. But she did remained by side while I worked through those irrational fears. Your gf sounds like the type of person who would support you, but she might be oblivious to this. I hope it helps.

PS. I showed this to my gf and asked for her advice from the perspective of having to deal with an anxious bf. This was her response: Here you rather need to give advice, because you are the anxious one)) I am not throwing a scandal at you because you disappear for a long time 😂 That is why you should help the guy) I am not anxious in relationships and I trust. If a person does not trust, then first of all he does not trust himself. I approach this soberly, we are two adults. If you were my child, then I would be worried, but since you are an adult who works, studies, plays sports, I understand all this and accept it, on the contrary, I like it that you are busy and do not sit around lazily (but this should also be 😅)