Nursing strike?

So my youngest son is almost 5mo & the last few days trying to get him to nurse has been such a struggle. If I even put him close to my chest he literally screams. I finally caved & gave him a bottle of expressed milk & he was so happy.

Idk what’s going on. I know my supply is still good because if I even hand express milk comes out. & if I do manage to get him latched I can hear him swallowing. But he doesn’t stay latched for very long if I do get him to

I’m at a loss, anyone have any ideas? He may be teething but even after giving him cold teethers, Tylenol or anything to help he still doesn’t even want anything to do with breastfeeding. He cries if I even try to get him into position to feed. I know there’s nothing wrong with him like being hurt because he’ll be so content playing on his back or side or tummy if he isn’t trying to eat. I’m so confused. He hasn’t had a bottle up until today too. I tried in the past, like a couple months ago & he straight up refused