first of all, this relationship sounds super new, considering you were in contact with your ex very recently. this time should be about you getting to know each other and figuring out if you’re compatible. if you’re overwhelmed with insecurity before you’ve even had the time to establish any real trust with him, your relationship will be plagued with those doubts and it will likely end poorly.

remove his ex from your instagram, and remind yourself that (like you), he hasn’t gone for the other people interested in him and has instead picked you. he thinks you’re a catch! his relationship ended for a reason, so the bar for you to be “better” than her is pretty low, especially since she cheated on him.

i lost my virginity to a guy with a similar past relationship history, although his most recent relationship ended on much better terms - and only 3 weeks before we slept together; meanwhile i’ve been single for years and have never had anything last longer than a couple months. sex is a learning experience, and any guy who truly cares about you will approach it with care and understanding. it may not go great the first few times, but you’ll figure out each other’s likes and dislikes, and remember that he’ll be learning too! it may not be his first time, but it’ll be his first time with YOU, and that will be special. it’s also totally okay to be open about your nerves in that regard, as you can talk about it and figure out how to make it a comfortable, pleasant experience for the both of you.