My partner and I have been together for almost 3 years now. I struggled in the beginning of our relationship before we were official convinced they were going home to see their ex back when they were still in college and would go home to their parents house 
I  would go through their messages and stuff with her  but eventually we had a talk(I had a massive panic attack and word vomited it all out at like 11pm let's be real) and they removed her from everything and reassured me everything was fine and they wanted to be with me 
Cool problem solved
Fast-forward to now and I'm for whatever fucking reason I'm convinced they're cheating 
I have no reason to believe they are 
I have no evidence they are 
&amp; no I haven't been looking for anything either 
Actually I've been struggling with urges to go their shit 
&amp; last night I had an awful dream they gaslight me but I actually found evidence they were cheating 
I've been cheated on by pretty much everyone in the past &amp; this is becoming my longest standing relationship truth be told I'm terrified 
It's like I can't wrap my head around having a relationship go this well for this long 
Anyone else do this? 
Been through this? 
Advice? 
I feel like I'm going to self sabotage at some point &amp; ruin everything 😩

And me constantly needing reassurance more frequently lately has got to be so very annoying