fighting more than usual?

me and my boyfriend have been having many more ups and downs through this quarantine than we did before and it’s just making me wonder if we are meant to be together or not. i saw another post where a girl was saying that her and boyfriend were struggling and someone said “if you cant make it through this then clearly you werent meant to be”, so honestly idk. and its really stupid stuff like i saw he liked another girls facebook post, a girl i have told him i didnt care for at all, but he never likes any of my facebook posts. but when i approached him about it he got defensive and tried to tell me he didnt do it, even tho there was clearly proof that he did right on facebook. i wasnt mad about him just liking her post, annoyed, yes, but it was the way he reacted to it. and then stupid arguments come from stuff like that. idk, what do you think i should do?