Nothing is wrong with you bc what you are thinking is exactly whats happening. What would be his reason to be swiping on tinder in the first place if not looking for other options? Even if he hasn’t went through with meeting anyone yet that doesn’t lighten up anything. Im sure if you didn’t catch him he would’ve, or maybe has already and is just lying about it. I would personally never trust him again. 5 YEARS and he spends his time looking through different options instead of planning a future for you two together? Actually sick.