Hi I just need some help in being rational and staying calm.
When DP and I met I was at uni and pretty much all my friends did MD or Coke before a night out so that they could stay up til 7am which the events they liked went on til. I didn't really judge but it wasn't my thing. I did try them once/twice, didn't dislike it but didn't care for it.
Now we're post university those friends have grown up and don't touch them anymore but are not opposed.
DP is older and also liked to take drugs for those nights out but when we met I said I didn't want to be with that person and he agreed he wouldn't / would try not to.
We've been together 5 years and he has probably done drugs about 4 times always with me present at an event. I didn't like it but couldn't really explain why.
DP is liberal and believes drugs are better than alcohol and safer (if in proper form). I somewhat agree with him but still get this horrible feeling.
So anyway, a few months ago DP and I were going out separately. His friend text asking if he should buy some coke, my DP knows I saw and saw my face so replied saying no thanks. Friend commented that DP was a changed man or some kind of joke but that was it. This friend knew him from his days before me when he would do it.
DP doesn't go out very much (a couple of times a year) so he isn't doing it behind my back.
However, this friend just text my DP and it's something weird, showing him a message he received that's "funny" and I think it's from a drug dealer. He's showing my DP in a "haha look at this" kind of way but it's got me thinking whether or not that night they did do cocaine.
DP swore when I asked back then that he didn't and wouldn't (but wish he had) and I believed him.
Thing is that now I wouldn't know unless his friend said and it caught him out. DP would probably lie to stop himself getting in trouble about something he doesn't think should upset me (he wouldn't lie about something like cheating etc - I hope!)
Also, I remember after their night out DP transferred money for drinks to said friend and I remember thinking it was odd because it's quite normal to end up owing someone for a drink and not paying them back just getting one next time and from his bank statement (saw for innocent reasons) he'd bought a fair few rounds that night so unlikely he'd owe him much...
I don't think it's worth me getting so angry or accusing him as he probably won't tell me. How do I approach it from here? I don't want to react.
Sorry this is so long!