I am convinced something is up with dp, he tells me it's nothing

[HeatwaveBaby]

have had to namechange

A woman has been popping up on dp's WhatsApp. He does not have it set to pop up so I've only noticed this on the very odd occasion he has shown me something on WhatsApp from someone else. This happened once last year and then again in the last few weeks I've noticed her name again. I confronted dp and he said she was an ex who he is not interested in anymore who has come back to ask for relationship help as she's v unhappy.

I googled her and found 2 possibilities but I wrongly assumed it was one as she is physically v much dp's type (and lives miles away so I thought probably nothing in it).

The other woman actually works at one of our suppliers. I happen to be going to that supplier this week and dropped it into conversation last night (not deliberately) and I could see dp froze. He then picked up his phone while I was talking and was furiously messaging someone.

I desperately desperately want to believe him. But I am now so suspicious. I know a lot of people that work there and could possibly delve and find out but it could also backfire on me. How else could I do this? (I won't get near his phone and he has never proven to be untrustworthy before - right up to last night and the conversation about the supplier, I 100% believed him).

Option 1, he's having an affair and enjoying the thrill and secrecy. You have picked up on his change in behaviour.

Option 2, he's not having an affair, but his behaviour is telling you that something is wrong. You sense something or else you wouldn't be posting.

Aside from all of this, what interest does he show in you?

When you are unhappy and need to talk, you don't normally think to contact a previous ex and discuss it with them.

There is something going on here that doesn't add up.