NEED ADVICE ASAP

So my partner and I have been together since we were 14 and were now 20, I literally couldn’t imagine my life with out him. I’ve recently got back in contact with an old friend and he’d done a lot for me in the past and we did used to have a bit of thing he’s a bit older. I know for a fact my boyfriend wouldn’t be happy, but we’re just friends.

I don’t know if it’s because we haven’t spoken in years, but I wait for his messages and I love talking to him he makes me feel so good, but I do love my boyfriend should I feel guilty I wouldn’t do or say anything that would cross a line, but I feel my head is a bit scrabbled. I know this has nothing to do with it but my nan did pass away ans we were super close, so I don’t know if it’s because my mind is so scrabbled. Please I need advice ASAP