Should I stop talking to this guy I become friends with last summer?

VenusxoxLove
Last summer I became friends with this guy James who works at the local store. Whenever I see him we talk sometimes he'll act like he's stocking stuff just to talk to me sometimes we text. But we are not dating at all we are only friends.

There is another guy who also works at the store name Alex. We met years ago at the store and a couple of years ago we went out once and had sex. He was in and still is in a relationship I still speak to him sometimes. (Sometimes I leave pictures and other things for him. I do it in a discreet way and his manager is ok with it) But there are times when I don't speak to him at all. And sometimes when he sees me talking to the other guy he'll interrupt. The other day he saw me talking to the other guy and he came up and butted into our conversation.

I'm not sure why he does this when he's in a relationship. I don't know what the issue is because he and I are only friends and he has a girlfriend.
Should I stop talking to this guy I become friends with last summer?
2 Opinion