I have a gut feeling my boyfriend could be cheating or talking to another girl?

Anonymous
We've been in a relationship for 2 years. I have this gut feeling that he is talking to another girl. He's always using his phone and is always online every half hour even at work where he claims he's busy. His Instagram especially he follows a lot of hot girls. So my theory is he could be texting them on Instagram (there's a direct message option).

To put out some perspective. We actually got into a conversation about Instagram and social media, he asked do I get a lot of messages on insta. So I joked oh you probably message the hot girls. He replies "ya I do sure I've loads of time to be texting girls" being sarcastic cause he does work a tonne. I said but there's a lot better looking than me on Instagram (cos I know he follows them)

He replied he "doesn't care, it's not about who's better looking or not, it's about someone who actually loves me and wants to be with me" . He also said "sex with someone who loves me will always be better than with anyone else"

What at do you guys think of my situation. Am I being overly paranoid?
I have a gut feeling my boyfriend could be cheating or talking to another girl?
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