Potential Relationship OCD?

Hi all, I was wondering if I could get some advice on ways to handle thoughts I’ve been having recently. For the past few weeks I have been having extreme obsessive thoughts that my boyfriend is cheating on me. I keep justifying it as a “gut-feeling“ then seeking reassurance, then repeating this cycle and it is eating me up inside. I am unsure as to how exactly to handle this. My boyfriend pointed out today that he thinks this is an OCD thing, since it’s been so often without any evidence or anything. What should I do to handle this? I haven’t experienced any obsessive thoughts like this so far in my life, so this is new. I usually have them about other things and do rituals and whatnot, but this isn’t following an exact ritual other than asking for reassurance occasionally. Any advice on coping with this type of thought/pattern is much appreciate, thank you!!