hmmm. . .i think you should stop "assuming". though, it is all hard for people to do; so good luck! for you to already state "I have been in a relationship for the past year and a half with an awesome guy. . .he knows most of my past issues and is, for the most part, supportive, " i think you need to remember this and maybe write it down and/or hang it somewhere (maybe with his photo). so, when ever you have weird assumptive thoughts (sort paranoia), just remember that this guy is a decent guy who already understands you.

as for your strange "feeling" regarding the television, just "assume" the positive and think he was "hiding" this from you because he wanted to surprise you. as you think "positive" assumptions, approach him and verify with him why he did not mention this (large purchase) television to you.

again, this is just a suggestion, for i too have a hard time thinking "positive". though, i do realize how many folks say "positive" thinking is good & healthy. and after reading your post, it dawned on me that it is our "negative" thinking that leads to our insecurities, our paranoid "feeling". sometimes, we need to step away and think more "positive".

also, btw, i have never yet met an "awesome guy" who understands my past and is supportive with my idiosyncracies. i think the reason for my own negativity is that i have not been in the "light" of positives yet. evidently, for you to acknowledge that this guy you are with is "good", then embrace it. with your acknowledgment, something must be "true" if you recognize and he understands: there must be some goodness in between (in the transaction).

just realize we all have our idiosyncracies, but it is holding onto each other and going through those bums and awkwardness of those idiosyncracies that make each other stronger and defines the love more truthful.

good luck,
a stranger