I don't know what it is about this guy/relationship I just can't end it and now I know I have to.

To cut the story short I've been with him 3 years next month, we was broke up for 6 months and got back 6 months ago. 2 years ago he admitted to cheating the night before. We had a rocky start with him messaging girls etc. We got back together on what I thought where he had really grown up, he referred to himself in his before days as childish and immature.

When we were split up for 6 months a couple of people told me he and a girl was seen on stories etc, he was seen by my sister on New year's Day this year with her, (we had been messaging once a day for 2/3 months before getting back together on 26th jan), I kicked off at him and he said he thought I didn't wanna get back with him and that I just wanted to be friends.

Anywaaaaay, basically I had a vibe to check his phone tonight and I found that he has her in his blacklist numbers and she messaged him on 9th Feb, he messaged her 4 times and obvs deleted lots of messages from her on 24th Feb and he messaged her saying 'stranger?' on 14th may, 11 days before my bday. He also has a conversation with her from 16th march on what's app.

I know I need to end it but honestly no nasty comments coz there's something that keeps me here, but I need your guys opinions even if it's harsh, just keep it fair, this isn't easy for me