Letting go of (potentially) imagined scenarios
hi, a few weeks ago we had a house get-together with friends, etc. drank a good amount of alcohol, had a good time. my gf's ex boyfriend is friends with several people there (i met him before too, good guy). they talked and caught up, etc. (my gf and him are on good terms but dont necessarily talk a lot). towards the end of the night, my gf remembered she had something of his in her room. she said shed go get it for him. he went with her as well. they came back down a few minutes later.
heres where my mind takes over...what if they made out in her room? they were both kinda drunk, not too bad though. she has never done anything to betray my trust, and she remembers the whole night so she wasnt extremely drunk. they didn't act any differently when they came back down, and she didnt act any differently the next day either. if something would have happened, i feel like she has the type of personality to either show guilt about it, or tell me. she told me the next day that her ex likes me a lot too, which is good, she didnt seem like she had anything to hide, has always been very open.
i dont know why i have trust issues like this, my mind just takes over sometimes. do you think my thoughts have any ground here? or am i just being way too irrational? any ideas on how NOT to think this way? thanks!